Vulnerability in gogs

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

Gogs is an open source self-hosted Git service. Prior to 0.15.0+dev, an unauthenticated attacker can provide a backslash-containing target to the /redirect endpoint, and similar post-action redirect flows are also affected. internal/urlx/urlx.go IsSameSite validates a normalized form of the target while cmd/gogs/internal/web/web.go getRedirect and other callers use the original value in the Location response. This backslash normalization mismatch lets browsers interpret the Location value as a scheme-relative external URL, allowing links on a trusted Gogs domain to redirect victims to attacker-controlled content for phishing. This vulnerability is fixed in 0.15.0+dev.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund14 Oct 2026WID-SEC-2026-3955

  Gogs: Vulnerability allows displaying false information and bypassing security measures Translated from German

  CVE-2026-82402

[ References ]References

• github.com/gogs/gogs/blob/main/CHANGELOG.md
• github.com/gogs/gogs/commit/0aa820e6d572771551871c0b5f5f32dffc565e3e
• github.com/gogs/gogs/pull/8391
• github.com/gogs/gogs/security/advisories/GHSA-3g28-2vwg-gxq6