CWE-1321
AllowedImproperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Abstraction: Variant · Status: Incomplete
The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.
885 vulnerabilities reference this CWE, most recent first.
GHSA-7W8J-85WM-6XFQ
Vulnerability from github – Published: 2021-05-24 19:51 – Updated: 2025-11-04 16:34Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in jquery-bbq 1.2.1 allows a malicious user to inject properties into Object.prototype.
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "jquery-bbq"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "1.2.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2021-20086"
],
"database_specific": {
"cwe_ids": [
"CWE-1321"
],
"github_reviewed": true,
"github_reviewed_at": "2021-05-20T22:53:36Z",
"nvd_published_at": "2021-04-23T19:15:00Z",
"severity": "HIGH"
},
"details": "Improperly Controlled Modification of Object Prototype Attributes (\u0027Prototype Pollution\u0027) in jquery-bbq 1.2.1 allows a malicious user to inject properties into Object.prototype.",
"id": "GHSA-7w8j-85wm-6xfq",
"modified": "2025-11-04T16:34:47Z",
"published": "2021-05-24T19:51:58Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20086"
},
{
"type": "WEB",
"url": "https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/jquery-bbq.md"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20241108-0002"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"summary": "Prototype Pollution in jquery-bbq"
}
GHSA-82JV-9WJW-PQH6
Vulnerability from github – Published: 2024-04-17 22:26 – Updated: 2024-04-17 22:26Summary
A prototype pollution in derby can crash the application, if the application author has atypical HTML templates that feed user input into an object key.
Attribute keys are almost always developer-controlled, not end-user-controlled, so this shouldn't be an issue in practice for most applications.
Details
emit(context: Context, target: T) {
const node = traverseAndCreate(context.controller, this.segments);
node[this.lastSegment] = target;
this.addListeners(target, node, this.lastSegment);
}
The emit() function in src/templates/templates.ts is called without sanitizing the variable this.lastSegment. The variable this.lastSegment can be set to __proto__, and this will pollute the prototype of Javascipt Object (node['__proto__'] = target).
PoC
To reproduce this vulnerability, you can adjust the test case ignores DOM mutations in components\' create() in test/dom/ComponentHarness.mocha.js.
it('ignores DOM mutations in components\' create()', function() {
function Box() {}
Box.view = {
is: 'box',
- source: '<index:><div class="box" as="boxElement"></div>'
+ source: '<index:><div class="box" as="__proto__"></div>'
};
Box.prototype.create = function() {
this.boxElement.className = 'box-changed-in-create';
};
var harness = runner.createHarness('<view is="box" />', Box);
expect(harness).to.render('<div class="box"></div>');
});
When as attribute is controlled by attackers, the variable in this.lastSegment will exactly take value__proto__ and prototype pollution happens.
Patch
Add a check on this.lastSegment can prevent this attack.
emit(context: Context, target: T) {
const node = traverseAndCreate(context.controller, this.segments);
+ if (this.lastSegment.includes('__proto__') || this.lastSegment.includes('prototype')) {
+ throw new Error('Unsafe code detected');
+ }
node[this.lastSegment] = target;
this.addListeners(target, node, this.lastSegment);
}
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 2.3.1"
},
"package": {
"ecosystem": "npm",
"name": "derby"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.3.2"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 3.0.1"
},
"package": {
"ecosystem": "npm",
"name": "derby"
},
"ranges": [
{
"events": [
{
"introduced": "3.0.0"
},
{
"fixed": "3.0.2"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 4.0.0-beta.10"
},
"package": {
"ecosystem": "npm",
"name": "derby"
},
"ranges": [
{
"events": [
{
"introduced": "4.0.0-beta1"
},
{
"fixed": "4.0.0-beta.11"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [],
"database_specific": {
"cwe_ids": [
"CWE-1321"
],
"github_reviewed": true,
"github_reviewed_at": "2024-04-17T22:26:37Z",
"nvd_published_at": null,
"severity": "LOW"
},
"details": "### Summary\nA prototype pollution in derby can crash the application, if the application author has atypical HTML templates that feed user input into an object key.\n\nAttribute keys are almost always developer-controlled, not end-user-controlled, so this shouldn\u0027t be an issue in practice for most applications.\n\n### Details\n```\nemit(context: Context, target: T) {\n const node = traverseAndCreate(context.controller, this.segments);\n node[this.lastSegment] = target;\n this.addListeners(target, node, this.lastSegment);\n}\n```\nThe emit() function in src/templates/templates.ts is called without sanitizing the variable `this.lastSegment `. The variable `this.lastSegment ` can be set to `__proto__`, and this will pollute the prototype of Javascipt Object (`node[\u0027__proto__\u0027] = target`).\n\n### PoC\nTo reproduce this vulnerability, you can adjust the test case `ignores DOM mutations in components\\\u0027 create()` in `test/dom/ComponentHarness.mocha.js`.\n\n```\nit(\u0027ignores DOM mutations in components\\\u0027 create()\u0027, function() {\n function Box() {}\n Box.view = {\n is: \u0027box\u0027,\n- source: \u0027\u003cindex:\u003e\u003cdiv class=\"box\" as=\"boxElement\"\u003e\u003c/div\u003e\u0027\n+ source: \u0027\u003cindex:\u003e\u003cdiv class=\"box\" as=\"__proto__\"\u003e\u003c/div\u003e\u0027\n };\n Box.prototype.create = function() {\n this.boxElement.className = \u0027box-changed-in-create\u0027;\n };\n var harness = runner.createHarness(\u0027\u003cview is=\"box\" /\u003e\u0027, Box);\n expect(harness).to.render(\u0027\u003cdiv class=\"box\"\u003e\u003c/div\u003e\u0027);\n});\n```\nWhen `as` attribute is controlled by attackers, the variable in `this.lastSegment` will exactly take value` __proto__` and prototype pollution happens.\n\n### Patch\nAdd a check on `this.lastSegment` can prevent this attack.\n```\nemit(context: Context, target: T) {\n const node = traverseAndCreate(context.controller, this.segments);\n+ if (this.lastSegment.includes(\u0027__proto__\u0027) || this.lastSegment.includes(\u0027prototype\u0027)) {\n+ throw new Error(\u0027Unsafe code detected\u0027);\n+ }\n node[this.lastSegment] = target;\n this.addListeners(target, node, this.lastSegment);\n}\n```\n",
"id": "GHSA-82jv-9wjw-pqh6",
"modified": "2024-04-17T22:26:37Z",
"published": "2024-04-17T22:26:37Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/derbyjs/derby/security/advisories/GHSA-82jv-9wjw-pqh6"
},
{
"type": "WEB",
"url": "https://github.com/derbyjs/derby/commit/24524e96f36976883c7c619811320428536bd4d0"
},
{
"type": "WEB",
"url": "https://github.com/derbyjs/derby/commit/465a0c2f6a77361eda4a09b77a8c94ba6a9da440"
},
{
"type": "PACKAGE",
"url": "https://github.com/derbyjs/derby"
}
],
"schema_version": "1.4.0",
"severity": [],
"summary": "Prototype pollution in emit function"
}
GHSA-83P6-2P5W-42RC
Vulnerability from github – Published: 2026-08-11 15:32 – Updated: 2026-08-11 15:32n8n before 1.123.67, 2.31.5, and 2.32.1 contains a prototype pollution vulnerability in the VM expression engine. An authenticated user able to create or edit a workflow expression can abuse the engine's array-element access to obtain a reference to a host built-in and pollute its prototype in the main n8n process (a sandbox escape), leading to a denial of service. Both self-hosted and cloud instances running the VM expression engine are affected.
{
"affected": [],
"aliases": [
"CVE-2026-72769"
],
"database_specific": {
"cwe_ids": [
"CWE-1321"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-11T13:19:07Z",
"severity": "MODERATE"
},
"details": "n8n before 1.123.67, 2.31.5, and 2.32.1 contains a prototype pollution vulnerability in the VM expression engine. An authenticated user able to create or edit a workflow expression can abuse the engine\u0027s array-element access to obtain a reference to a host built-in and pollute its prototype in the main n8n process (a sandbox escape), leading to a denial of service. Both self-hosted and cloud instances running the VM expression engine are affected.",
"id": "GHSA-83p6-2p5w-42rc",
"modified": "2026-08-11T15:32:37Z",
"published": "2026-08-11T15:32:37Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-hx4h-vr3m-45vh"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72769"
},
{
"type": "WEB",
"url": "https://www.vulncheck.com/advisories/n8n-before-prototype-pollution-via-vm-expression-engine"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
]
}
GHSA-83PQ-466J-FC6J
Vulnerability from github – Published: 2020-09-04 15:17 – Updated: 2020-08-31 18:55All versions of sahmat are vulnerable to prototype pollution. The package does not restrict the modification of an Object's prototype, which may allow an attacker to add or modify an existing property that will exist on all objects.
Recommendation
No fix is currently available. Consider using an alternative package until a fix is made available.
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "sahmat"
},
"ranges": [
{
"events": [
{
"introduced": "0.0.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [],
"database_specific": {
"cwe_ids": [
"CWE-1321"
],
"github_reviewed": true,
"github_reviewed_at": "2020-08-31T18:55:34Z",
"nvd_published_at": null,
"severity": "HIGH"
},
"details": "All versions of `sahmat ` are vulnerable to prototype pollution. The package does not restrict the modification of an Object\u0027s prototype, which may allow an attacker to add or modify an existing property that will exist on all objects.\n\n\n\n\n## Recommendation\n\nNo fix is currently available. Consider using an alternative package until a fix is made available.",
"id": "GHSA-83pq-466j-fc6j",
"modified": "2020-08-31T18:55:34Z",
"published": "2020-09-04T15:17:50Z",
"references": [
{
"type": "WEB",
"url": "https://www.npmjs.com/advisories/1336"
}
],
"schema_version": "1.4.0",
"severity": [],
"summary": "Prototype Pollution in sahmat"
}
GHSA-84G3-CV89-M9GM
Vulnerability from github – Published: 2021-10-13 15:33 – Updated: 2021-10-06 22:34Prototype pollution vulnerability in 'patchmerge' versions 1.0.0 through 1.0.1 allows an attacker to cause a denial of service and may lead to remote code execution.
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "patchmerge"
},
"ranges": [
{
"events": [
{
"introduced": "1.0.0"
},
{
"fixed": "1.0.2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2021-25916"
],
"database_specific": {
"cwe_ids": [
"CWE-1321"
],
"github_reviewed": true,
"github_reviewed_at": "2021-10-06T22:34:42Z",
"nvd_published_at": "2021-03-16T16:15:00Z",
"severity": "CRITICAL"
},
"details": "Prototype pollution vulnerability in \u0027patchmerge\u0027 versions 1.0.0 through 1.0.1 allows an attacker to cause a denial of service and may lead to remote code execution.",
"id": "GHSA-84g3-cv89-m9gm",
"modified": "2021-10-06T22:34:42Z",
"published": "2021-10-13T15:33:20Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-25916"
},
{
"type": "WEB",
"url": "https://github.com/pjshumphreys/patchmerge/commit/5b383c537eae7a00ebd26d3f7211dac99ddecb12"
},
{
"type": "PACKAGE",
"url": "https://github.com/pjshumphreys/patchmerge"
},
{
"type": "WEB",
"url": "https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25916"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"summary": "Prototype pollution vulnerability in \u0027patchmerge\u0027"
}
GHSA-84P7-FH9C-6G8H
Vulnerability from github – Published: 2021-09-20 19:52 – Updated: 2021-09-16 21:30Impact
When copying properties from a source object to a target object, the target object can gain access to certain properties of the source object and modify their content.
Patches
The problem was patch with a more agressive discovery of secured properties to filter out.
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "mixme"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.5.2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [],
"database_specific": {
"cwe_ids": [
"CWE-1321"
],
"github_reviewed": true,
"github_reviewed_at": "2021-09-16T21:30:18Z",
"nvd_published_at": null,
"severity": "HIGH"
},
"details": "### Impact\nWhen copying properties from a source object to a target object, the target object can gain access to certain properties of the source object and modify their content.\n\n### Patches\nThe problem was patch with a more agressive discovery of secured properties to filter out.\n",
"id": "GHSA-84p7-fh9c-6g8h",
"modified": "2021-09-16T21:30:18Z",
"published": "2021-09-20T19:52:24Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/adaltas/node-mixme/security/advisories/GHSA-84p7-fh9c-6g8h"
},
{
"type": "WEB",
"url": "https://github.com/adaltas/node-mixme/issues/1"
},
{
"type": "WEB",
"url": "https://github.com/adaltas/node-mixme/issues/2"
},
{
"type": "WEB",
"url": "https://github.com/adaltas/node-mixme/commit/db70fe9bcbba451e9f8bd794a9fa7cdfa00125ad"
},
{
"type": "PACKAGE",
"url": "https://github.com/adaltas/node-mixme"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-79jw-6wg7-r9g4"
}
],
"schema_version": "1.4.0",
"severity": [],
"summary": "Prototype Pollution in mixme"
}
GHSA-85CP-P426-42F5
Vulnerability from github – Published: 2021-05-06 18:12 – Updated: 2021-05-05 18:16All versions of package deep-get-set prior to version 1.1.1 are vulnerable to Prototype Pollution via the main function.
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "deep-get-set"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.1.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2020-7715"
],
"database_specific": {
"cwe_ids": [
"CWE-1321"
],
"github_reviewed": true,
"github_reviewed_at": "2021-05-05T18:16:57Z",
"nvd_published_at": "2020-09-01T10:15:00Z",
"severity": "HIGH"
},
"details": "All versions of package deep-get-set prior to version 1.1.1 are vulnerable to Prototype Pollution via the main function.",
"id": "GHSA-85cp-p426-42f5",
"modified": "2021-05-05T18:16:57Z",
"published": "2021-05-06T18:12:59Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-7715"
},
{
"type": "WEB",
"url": "https://github.com/acstll/deep-get-set/commit/a127e65bc77ff5707a6a103819e140d11475c5f4"
},
{
"type": "WEB",
"url": "https://snyk.io/vuln/SNYK-JS-DEEPGETSET-598666"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"summary": "Prototype Pollution in deep-get-set"
}
GHSA-85G2-29M8-QF2P
Vulnerability from github – Published: 2021-03-19 21:18 – Updated: 2021-03-16 22:49Prototype pollution vulnerability in 'object-collider' versions 1.0.0 through 1.0.3 allows attacker to cause a denial of service and may lead to remote code execution.
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "object-collider"
},
"ranges": [
{
"events": [
{
"introduced": "1.0.0"
},
{
"fixed": "1.0.4"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2021-25914"
],
"database_specific": {
"cwe_ids": [
"CWE-1321"
],
"github_reviewed": true,
"github_reviewed_at": "2021-03-16T22:49:14Z",
"nvd_published_at": "2021-03-01T18:15:00Z",
"severity": "CRITICAL"
},
"details": "Prototype pollution vulnerability in \u0027object-collider\u0027 versions 1.0.0 through 1.0.3 allows attacker to cause a denial of service and may lead to remote code execution.",
"id": "GHSA-85g2-29m8-qf2p",
"modified": "2021-03-16T22:49:14Z",
"published": "2021-03-19T21:18:33Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-25914"
},
{
"type": "WEB",
"url": "https://github.com/FireBlinkLTD/object-collider/commit/321f75a7f8e7b3393e5b7dd6dd9ab26ede5906e5"
},
{
"type": "WEB",
"url": "https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25914"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"summary": "Prototype Pollution Vulnerability in object-collider"
}
GHSA-866W-WM4H-95C6
Vulnerability from github – Published: 2022-10-12 12:00 – Updated: 2024-04-22 23:20Prototype pollution vulnerability in function resolveShims in resolve-shims.js in thlorenz browserify-shim 3.8.15 via the k variable in resolve-shims.js.
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 3.8.15"
},
"package": {
"ecosystem": "npm",
"name": "browserify-shim"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.8.16"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2022-37617"
],
"database_specific": {
"cwe_ids": [
"CWE-1321"
],
"github_reviewed": true,
"github_reviewed_at": "2024-04-22T23:20:58Z",
"nvd_published_at": "2022-10-11T23:15:00Z",
"severity": "CRITICAL"
},
"details": "Prototype pollution vulnerability in function `resolveShims` in resolve-shims.js in thlorenz browserify-shim 3.8.15 via the `k` variable in resolve-shims.js.",
"id": "GHSA-866w-wm4h-95c6",
"modified": "2024-04-22T23:20:58Z",
"published": "2022-10-12T12:00:18Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-37617"
},
{
"type": "WEB",
"url": "https://github.com/thlorenz/browserify-shim/issues/245"
},
{
"type": "WEB",
"url": "https://github.com/thlorenz/browserify-shim/pull/246"
},
{
"type": "WEB",
"url": "https://github.com/thlorenz/browserify-shim/commit/97855e622b6dcd117c77e6583701962ff45e7338"
},
{
"type": "PACKAGE",
"url": "https://github.com/thlorenz/browserify-shim"
},
{
"type": "WEB",
"url": "https://github.com/thlorenz/browserify-shim/blob/464b32bbe142664cd9796059798f6c738ea3de8f/lib/resolve-shims.js#L130"
},
{
"type": "WEB",
"url": "https://github.com/thlorenz/browserify-shim/blob/464b32bbe142664cd9796059798f6c738ea3de8f/lib/resolve-shims.js#L158"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"summary": "thlorenz browserify-shim vulnerable to prototype pollution"
}
GHSA-866W-XMHQ-WJ7X
Vulnerability from github – Published: 2026-07-24 15:58 – Updated: 2026-07-24 15:58If you use remote form functions, have an input field of type file, and accept arbitrary user-controlled path names for the field, then you are vulnerable to a prototype pollution attack where the attacker can remove e.g. methods on the prototype.
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 2.69.0"
},
"package": {
"ecosystem": "npm",
"name": "@sveltejs/kit"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.69.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [],
"database_specific": {
"cwe_ids": [
"CWE-1321"
],
"github_reviewed": true,
"github_reviewed_at": "2026-07-24T15:58:05Z",
"nvd_published_at": null,
"severity": "MODERATE"
},
"details": "If you use remote form functions, have an input field of type `file`, and accept arbitrary user-controlled path names for the field, then you are vulnerable to a prototype pollution attack where the attacker can remove e.g. methods on the prototype.",
"id": "GHSA-866w-xmhq-wj7x",
"modified": "2026-07-24T15:58:05Z",
"published": "2026-07-24T15:58:05Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/sveltejs/kit/security/advisories/GHSA-866w-xmhq-wj7x"
},
{
"type": "WEB",
"url": "https://github.com/sveltejs/kit/pull/16218"
},
{
"type": "WEB",
"url": "https://github.com/sveltejs/kit/commit/df32f6fe86cdd0b68b650e3e4631e5896453dcd3"
},
{
"type": "PACKAGE",
"url": "https://github.com/sveltejs/kit"
},
{
"type": "WEB",
"url": "https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@2.69.1"
},
{
"type": "WEB",
"url": "https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@3.0.0-next.7"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
}
],
"summary": "SvelteKit: Prototype pollution in file input deletion path in remote-function forms"
}
Mitigation
By freezing the object prototype first (for example, Object.freeze(Object.prototype)), modification of the prototype becomes impossible.
Mitigation
By blocking modifications of attributes that resolve to object prototype, such as proto or prototype, this weakness can be mitigated.
Mitigation
Strategy: Input Validation
When handling untrusted objects, validating using a schema can be used.
Mitigation
By using an object without prototypes (via Object.create(null) ), adding object prototype attributes by accessing the prototype via the special attributes becomes impossible, mitigating this weakness.
Mitigation
Map can be used instead of objects in most cases. If Map methods are used instead of object attributes, it is not possible to access the object prototype or modify it.
CAPEC-1: Accessing Functionality Not Properly Constrained by ACLs
In applications, particularly web applications, access to functionality is mitigated by an authorization framework. This framework maps Access Control Lists (ACLs) to elements of the application's functionality; particularly URL's for web apps. In the case that the administrator failed to specify an ACL for a particular element, an attacker may be able to access it with impunity. An attacker with the ability to access functionality not properly constrained by ACLs can obtain sensitive information and possibly compromise the entire application. Such an attacker can access resources that must be available only to users at a higher privilege level, can access management sections of the application, or can run queries for data that they otherwise not supposed to.
CAPEC-180: Exploiting Incorrectly Configured Access Control Security Levels
An attacker exploits a weakness in the configuration of access controls and is able to bypass the intended protection that these measures guard against and thereby obtain unauthorized access to the system or network. Sensitive functionality should always be protected with access controls. However configuring all but the most trivial access control systems can be very complicated and there are many opportunities for mistakes. If an attacker can learn of incorrectly configured access security settings, they may be able to exploit this in an attack.
CAPEC-77: Manipulating User-Controlled Variables
This attack targets user controlled variables (DEBUG=1, PHP Globals, and So Forth). An adversary can override variables leveraging user-supplied, untrusted query variables directly used on the application server without any data sanitization. In extreme cases, the adversary can change variables controlling the business logic of the application. For instance, in languages like PHP, a number of poorly set default configurations may allow the user to override variables.