CVE-2026-52843 (GCVE-0-2026-52843)
Vulnerability from cvelistv5 – Published: 2026-07-15 16:16 – Updated: 2026-07-15 17:37
VLAI
EPSS
VEX
Title
Lightpanda: fetch() and XMLHttpRequest attach session cookies to cross-origin requests regardless of credentials mode
Summary
Lightpanda is a headless browser designed for AI and automation. Prior to 0.2.9, Lightpanda fetch() and XMLHttpRequest unconditionally attached session cookies to every HTTP request, ignoring credentials: omit, credentials: same-origin, credentials: include, and XMLHttpRequest.withCredentials, allowing an attacker-controlled origin in a Lightpanda session to issue authenticated cross-origin requests against a victim origin. This issue is fixed in version 0.2.9.
Severity
9.3 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 17:37 UTC
CWE
- CWE-346 - Origin Validation Error
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/lightpanda-io/browser/security… | x_refsource_CONFIRM |
| https://github.com/lightpanda-io/browser/pull/2155 | x_refsource_MISC |
| https://github.com/lightpanda-io/browser/commit/2… | x_refsource_MISC |
| https://github.com/lightpanda-io/browser/releases… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| lightpanda-io | browser |
Affected:
< 0.2.9
|
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-52843",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-15T17:37:05.863200Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-15T17:37:26.880Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "browser",
"vendor": "lightpanda-io",
"versions": [
{
"status": "affected",
"version": "\u003c 0.2.9"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Lightpanda is a headless browser designed for AI and automation. Prior to 0.2.9, Lightpanda fetch() and XMLHttpRequest unconditionally attached session cookies to every HTTP request, ignoring credentials: omit, credentials: same-origin, credentials: include, and XMLHttpRequest.withCredentials, allowing an attacker-controlled origin in a Lightpanda session to issue authenticated cross-origin requests against a victim origin. This issue is fixed in version 0.2.9."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 9.3,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-346",
"description": "CWE-346: Origin Validation Error",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-15T16:16:07.762Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/lightpanda-io/browser/security/advisories/GHSA-36mm-v3c2-24cc",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/lightpanda-io/browser/security/advisories/GHSA-36mm-v3c2-24cc"
},
{
"name": "https://github.com/lightpanda-io/browser/pull/2155",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/lightpanda-io/browser/pull/2155"
},
{
"name": "https://github.com/lightpanda-io/browser/commit/2cdaac780bed65db98bbb6ed2ad5bc6011863c76",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/lightpanda-io/browser/commit/2cdaac780bed65db98bbb6ed2ad5bc6011863c76"
},
{
"name": "https://github.com/lightpanda-io/browser/releases/tag/0.2.9",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/lightpanda-io/browser/releases/tag/0.2.9"
}
],
"source": {
"advisory": "GHSA-36mm-v3c2-24cc",
"discovery": "UNKNOWN"
},
"title": "Lightpanda: fetch() and XMLHttpRequest attach session cookies to cross-origin requests regardless of credentials mode"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-52843",
"datePublished": "2026-07-15T16:16:07.762Z",
"dateReserved": "2026-06-08T18:41:27.724Z",
"dateUpdated": "2026-07-15T17:37:26.880Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-52843",
"date": "2026-09-19",
"epss": "0.00234",
"percentile": "0.14641"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"product": "browser",
"vendor": "lightpanda-io",
"versions": [
{
"status": "affected",
"version": "\u003c 0.2.9"
}
]
}
],
"source": "security-advisories@github.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Lightpanda is a headless browser designed for AI and automation. Prior to 0.2.9, Lightpanda fetch() and XMLHttpRequest unconditionally attached session cookies to every HTTP request, ignoring credentials: omit, credentials: same-origin, credentials: include, and XMLHttpRequest.withCredentials, allowing an attacker-controlled origin in a Lightpanda session to issue authenticated cross-origin requests against a victim origin. This issue is fixed in version 0.2.9."
}
],
"id": "CVE-2026-52843",
"lastModified": "2026-07-15T20:50:57.257",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 9.3,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 5.8,
"source": "security-advisories@github.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-52843",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-15T17:37:05.863200Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-07-15T17:16:50.467",
"references": [
{
"source": "security-advisories@github.com",
"url": "https://github.com/lightpanda-io/browser/commit/2cdaac780bed65db98bbb6ed2ad5bc6011863c76"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/lightpanda-io/browser/pull/2155"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/lightpanda-io/browser/releases/tag/0.2.9"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/lightpanda-io/browser/security/advisories/GHSA-36mm-v3c2-24cc"
}
],
"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-346"
}
],
"source": "security-advisories@github.com",
"type": "Secondary"
}
]
}
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-52843",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-15T17:37:05.863200Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-15T17:37:21.915Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "browser",
"vendor": "lightpanda-io",
"versions": [
{
"status": "affected",
"version": "\u003c 0.2.9"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Lightpanda is a headless browser designed for AI and automation. Prior to 0.2.9, Lightpanda fetch() and XMLHttpRequest unconditionally attached session cookies to every HTTP request, ignoring credentials: omit, credentials: same-origin, credentials: include, and XMLHttpRequest.withCredentials, allowing an attacker-controlled origin in a Lightpanda session to issue authenticated cross-origin requests against a victim origin. This issue is fixed in version 0.2.9."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 9.3,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-346",
"description": "CWE-346: Origin Validation Error",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-15T16:16:07.762Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/lightpanda-io/browser/security/advisories/GHSA-36mm-v3c2-24cc",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/lightpanda-io/browser/security/advisories/GHSA-36mm-v3c2-24cc"
},
{
"name": "https://github.com/lightpanda-io/browser/pull/2155",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/lightpanda-io/browser/pull/2155"
},
{
"name": "https://github.com/lightpanda-io/browser/commit/2cdaac780bed65db98bbb6ed2ad5bc6011863c76",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/lightpanda-io/browser/commit/2cdaac780bed65db98bbb6ed2ad5bc6011863c76"
},
{
"name": "https://github.com/lightpanda-io/browser/releases/tag/0.2.9",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/lightpanda-io/browser/releases/tag/0.2.9"
}
],
"source": {
"advisory": "GHSA-36mm-v3c2-24cc",
"discovery": "UNKNOWN"
},
"title": "Lightpanda: fetch() and XMLHttpRequest attach session cookies to cross-origin requests regardless of credentials mode"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-52843",
"datePublished": "2026-07-15T16:16:07.762Z",
"dateReserved": "2026-06-08T18:41:27.724Z",
"dateUpdated": "2026-07-15T17:37:26.880Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…