What’s Vulnerable › Vulnerabilities

CVE-2026-44502: Bugsink: SSRF bypass in `validate_webhook_url`

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-26 · updated 2026-07-24
• Weakness: CWE-918

Description

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.

Affected products

• bugsink: before 2.1.3

References

• https://github.com/bugsink/bugsink/commit/940d2df635e06803ef658666d734306942db5cc7
• https://github.com/bugsink/bugsink/releases/tag/2.1.3
• https://github.com/bugsink/bugsink/security/advisories/GHSA-fp53-qcf8-2xx2

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