CVE-2026-44502

MEDIUM 4.3

Bugsink: SSRF bypass in `validate_webhook_url`

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

7th

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.

CWE	CWE-918
Vendor	bugsink
Product	bugsink
Published	May 26, 2026
Last Updated	May 27, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

bugsink / bugsink

< 2.1.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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