FKIE_CVE-2026-44502

Vulnerability from fkie_nvd - Published: 2026-05-26 17:16 - Updated: 2026-05-26 19:37
Severity
4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Summary
Bugsink is a self-hosted error tracking tool. Prior to 2.1.3, Bugsink’s webhook URL validation could be (partially) bypassed because of a mismatch in URL parsing. The original validation logic parsed webhook URLs with Python’s urllib.parse.urlparse, then sent the request with requests.post. For malformed inputs involving backslashes and @, those components can disagree about where the authority ends and which hostname is the real target. A URL may therefore appear to target an allowlisted public hostname during validation, while the HTTP client actually connects to a different host. This vulnerability is fixed in 2.1.3.
References
security-advisories@github.comhttps://github.com/bugsink/bugsink/commit/940d2df635e06803ef658666d734306942db5cc7
security-advisories@github.comhttps://github.com/bugsink/bugsink/releases/tag/2.1.3
security-advisories@github.comhttps://github.com/bugsink/bugsink/security/advisories/GHSA-fp53-qcf8-2xx2
Impacted products
Vendor Product Version
To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Bugsink is a self-hosted error tracking tool. Prior to 2.1.3, Bugsink\u2019s webhook URL validation could be (partially) bypassed because of a mismatch in URL parsing. The original validation logic parsed webhook URLs with Python\u2019s urllib.parse.urlparse, then sent the request with requests.post. For malformed inputs involving backslashes and @, those components can disagree about where the authority ends and which hostname is the real target. A URL may therefore appear to target an allowlisted public hostname during validation, while the HTTP client actually connects to a different host. This vulnerability is fixed in 2.1.3."
    }
  ],
  "id": "CVE-2026-44502",
  "lastModified": "2026-05-26T19:37:00.120",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-26T17:16:46.387",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bugsink/bugsink/commit/940d2df635e06803ef658666d734306942db5cc7"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bugsink/bugsink/releases/tag/2.1.3"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bugsink/bugsink/security/advisories/GHSA-fp53-qcf8-2xx2"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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