CVE-2026-44502: Bugsink

Medium severity, CVSS 4.3. EPSS: 0.4% chance of exploitation in the next 30 days.

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 Bugsink: before 2.1.3 (fixed in 2.1.3)

Published 2026-05-26. Last modified 2026-07-24.