CVE-2026-40162: Bugsink affected by authenticated arbitrary file write in artifactbundle/assemble

Severity: high (CVSS 7.1 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: 2026-04-10 · updated 2026-06-17
Weakness: CWE-20

Description

Bugsink is a self-hosted error tracking tool. In 2.1.0, an authenticated file write vulnerability was identified in Bugsink 2.1.0 in the artifact bundle assembly flow. A user with a valid authentication token could cause the application to write attacker-controlled content to a filesystem location writable by the Bugsink process. This vulnerability is fixed in 2.1.1.

Affected products

bugsink: 2.1.0

References

https://github.com/bugsink/bugsink/releases/tag/2.1.1
https://github.com/bugsink/bugsink/security/advisories/GHSA-8hw4-fhww-273g

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