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.
Published: 2026-05-26
Score: 4.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-fp53-qcf8-2xx2 Bunsink has an SSRF bypass in `validate_webhook_url`
History

Wed, 27 May 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 26 May 2026 19:00:00 +0000

Type Values Removed Values Added
First Time appeared Bugsink
Bugsink bugsink
Vendors & Products Bugsink
Bugsink bugsink

Tue, 26 May 2026 17:00:00 +0000

Type Values Removed Values Added
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.
Title Bugsink: SSRF bypass in `validate_webhook_url`
Weaknesses CWE-918
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-27T17:21:38.121Z

Reserved: 2026-05-06T18:28:20.886Z

Link: CVE-2026-44502

cve-icon Vulnrichment

Updated: 2026-05-27T17:21:34.554Z

cve-icon NVD

Status : Deferred

Published: 2026-05-26T17:16:46.387

Modified: 2026-06-17T10:50:44.163

Link: CVE-2026-44502

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-26T19:45:06Z

Weaknesses