All vulnerabilities
CVE-2026-82402GHSA-3g28-2vwg-gxq6

Gogs: Open Redirect in /redirect endpoint via backslash bypass in `IsSameSite`

gogs gogs
Open in ThreatlineRecord JSON
CVSS
5.3Medium
ExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 20 Oct 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.34%Chance of exploitation activity in the next 30 days, higher than 25% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in0.15.0+devFixed versionGitHub
Published14 Oct 2026Updated 20 Oct 2026CVE List

What fixes it

  • 0.15.0+devgogs.io/gogs, goGitHubgo get gogs.io/gogs@v0.15.0+dev

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 2

  • gogsaffected: < 0.15.0+devCVE List
  • gogs.io/gogs, go0.15.0+devGitHub

References 4