cvelistv5 - cve-2025-61773

CVE-2025-61773 (GCVE-0-2025-61773)

Vulnerability from cvelistv5 – Published: 2025-10-09 20:49 – Updated: 2025-10-10 14:29

Summary

pyLoad is a free and open-source download manager written in Python. In versions prior to 0.5.0b3.dev91, pyLoad web interface contained insufficient input validation in both the Captcha script endpoint and the Click'N'Load (CNL) Blueprint. This flaw allowed untrusted user input to be processed unsafely, which could be exploited by an attacker to inject arbitrary content into the web UI or manipulate request handling. The vulnerability could lead to client-side code execution (XSS) or other unintended behaviors when a malicious payload is submitted. user-supplied parameters from HTTP requests were not adequately validated or sanitized before being passed into the application logic and response generation. This allowed crafted input to alter the expected execution flow. CNL (Click'N'Load) blueprint exposed unsafe handling of untrusted parameters in HTTP requests. The application did not consistently enforce input validation or encoding, making it possible for an attacker to craft malicious requests. Version 0.5.0b3.dev91 contains a patch for the issue.

Severity ?

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

CWE

CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-94 - Improper Control of Generation of Code ('Code Injection')
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-116 - Improper Encoding or Escaping of Output

Assigner

GitHub_M

References

URL

Tags

	https://github.com/pyload/pyload/security/advisor…	x_refsource_CONFIRM
	https://github.com/pyload/pyload/pull/4624	x_refsource_MISC
	https://github.com/pyload/pyload/commit/5823327d0…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	pyload	pyload	Affected: < 0.5.0b3.dev91

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2025-61773

Vulnerability from fkie_nvd - Published: 2025-10-09 21:15 - Updated: 2025-10-14 19:37

Severity ?

8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/pyload/pyload/commit/5823327d0b797161c7195a1f660266d30a69f0ca
	security-advisories@github.com	https://github.com/pyload/pyload/pull/4624
	security-advisories@github.com	https://github.com/pyload/pyload/security/advisories/GHSA-cjjf-27cc-pvmv
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/pyload/pyload/security/advisories/GHSA-cjjf-27cc-pvmv

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "pyLoad is a free and open-source download manager written in Python. In versions prior to 0.5.0b3.dev91, pyLoad web interface contained insufficient input validation in both the Captcha script endpoint and the Click\u0027N\u0027Load (CNL) Blueprint. This flaw allowed untrusted user input to be processed unsafely, which could be exploited by an attacker to inject arbitrary content into the web UI or manipulate request handling. The vulnerability could lead to client-side code execution (XSS) or other unintended behaviors when a malicious payload is submitted. user-supplied parameters from HTTP requests were not adequately validated or sanitized before being passed into the application logic and response generation. This allowed crafted input to alter the expected execution flow. CNL (Click\u0027N\u0027Load) blueprint exposed unsafe handling of untrusted parameters in HTTP requests. The application did not consistently enforce input validation or encoding, making it possible for an attacker to craft malicious requests. Version 0.5.0b3.dev91 contains a patch for the issue."
    }
  ],
  "id": "CVE-2025-61773",
  "lastModified": "2025-10-14T19:37:28.107",
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          "attackVector": "NETWORK",
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
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        "impactScore": 5.2,
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        "type": "Secondary"
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GHSA-CJJF-27CC-PVMV

Vulnerability from github – Published: 2025-10-09 15:19 – Updated: 2025-10-13 15:39

Summary

pyLoad CNL and captcha handlers allow Code Injection via unsanitized parameters

Details

Summary

pyLoad web interface contained insufficient input validation in both the Captcha script endpoint and the Click'N'Load (CNL) Blueprint. This flaw allowed untrusted user input to be processed unsafely, which could be exploited by an attacker to inject arbitrary content into the web UI or manipulate request handling. The vulnerability could lead to client-side code execution (XSS) or other unintended behaviors when a malicious payload is submitted.

user-supplied parameters from HTTP requests were not adequately validated or sanitized before being passed into the application logic and response generation. This allowed crafted input to alter the expected execution flow. CNL (Click'N'Load) blueprint exposed unsafe handling of untrusted parameters in HTTP requests. The application did not consistently enforce input validation or encoding, making it possible for an attacker to craft malicious requests.

PoC

Run a vulnerable version of pyLoad prior to commit f9d27f2.
Start the web UI and access the Captcha or CNL endpoints.
Submit a crafted request containing malicious JavaScript payloads in unvalidated parameters (/flash/addcrypted2?jk=function(){alert(1)}&crypted=12345).
Observe that the payload is reflected and executed in the client’s browser, demonstrating cross-site scripting (XSS).

Example request:

GET /flash/addcrypted2?jk=function(){alert(1)}&crypted=12345 HTTP/1.1
Host: 127.0.0.1:8000
Content-Type: application/x-www-form-urlencoded
Content-Length: 107

Impact

Exploiting this vulnerability allows an attacker to inject and execute arbitrary JavaScript within the browser session of a user accessing the pyLoad Web UI. In practice, this means an attacker could impersonate an administrator, steal authentication cookies or tokens, and perform unauthorized actions on behalf of the victim. Because the affected endpoints are part of the core interface, a successful attack undermines the trust and security of the entire application, potentially leading to a full compromise of the management interface and the data it controls. The impact is particularly severe in cases where the Web UI is exposed over a network without additional access restrictions, as it enables remote attackers to directly target users with crafted links or requests that trigger the vulnerability.

Severity ?

8.1 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "pyload-ng"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.5.0b3.dev91"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-61773"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-116",
      "CWE-74",
      "CWE-79",
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-10-09T15:19:48Z",
    "nvd_published_at": "2025-10-09T21:15:39Z",
    "severity": "HIGH"
  },
  "details": "### Summary\npyLoad web interface contained insufficient input validation in both the Captcha script endpoint and the Click\u0027N\u0027Load (CNL) Blueprint. This flaw allowed untrusted user input to be processed unsafely, which could be exploited by an attacker to inject arbitrary content into the web UI or manipulate request handling. The vulnerability could lead to client-side code execution (XSS) or other unintended behaviors when a malicious payload is submitted.\n\nuser-supplied parameters from HTTP requests were not adequately validated or sanitized before being passed into the application logic and response generation. This allowed crafted input to alter the expected execution flow.\n CNL (Click\u0027N\u0027Load) blueprint exposed unsafe handling of untrusted parameters in HTTP requests. The application did not consistently enforce input validation or encoding, making it possible for an attacker to craft malicious requests.\n\n### PoC\n\n1. Run a vulnerable version of pyLoad prior to commit [`f9d27f2`](https://github.com/pyload/pyload/pull/4624).\n2. Start the web UI and access the Captcha or CNL endpoints.\n3. Submit a crafted request containing malicious JavaScript payloads in unvalidated parameters (`/flash/addcrypted2?jk=function(){alert(1)}\u0026crypted=12345`).\n4. Observe that the payload is reflected and executed in the client\u2019s browser, demonstrating cross-site scripting (XSS).\n\nExample request:\n\n```http\nGET /flash/addcrypted2?jk=function(){alert(1)}\u0026crypted=12345 HTTP/1.1\nHost: 127.0.0.1:8000\nContent-Type: application/x-www-form-urlencoded\nContent-Length: 107\n```\n\n### Impact\n\nExploiting this vulnerability allows an attacker to inject and execute arbitrary JavaScript within the browser session of a user accessing the pyLoad Web UI. In practice, this means an attacker could impersonate an administrator, steal authentication cookies or tokens, and perform unauthorized actions on behalf of the victim. Because the affected endpoints are part of the core interface, a successful attack undermines the trust and security of the entire application, potentially leading to a full compromise of the management interface and the data it controls. The impact is particularly severe in cases where the Web UI is exposed over a network without additional access restrictions, as it enables remote attackers to directly target users with crafted links or requests that trigger the vulnerability.",
  "id": "GHSA-cjjf-27cc-pvmv",
  "modified": "2025-10-13T15:39:51Z",
  "published": "2025-10-09T15:19:48Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pyload/pyload/security/advisories/GHSA-cjjf-27cc-pvmv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-61773"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pyload/pyload/pull/4624"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pyload/pyload/commit/5823327d0b797161c7195a1f660266d30a69f0ca"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pyload/pyload"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "pyLoad CNL and captcha handlers allow Code Injection via unsanitized parameters"
}

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2025-61773 (GCVE-0-2025-61773)

FKIE_CVE-2025-61773

GHSA-CJJF-27CC-PVMV

Summary

PoC

Impact

Tags

Sightings

Nomenclature