What’s Vulnerable › Vulnerabilities

CVE-2026-82402: Gogs: Open Redirect in /redirect endpoint via backslash bypass in `IsSameSite`

• Severity: medium (CVSS 5.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-20
• Weakness: CWE-601

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.

Affected products

• gogs: before 0.15.0+dev

References

• https://github.com/gogs/gogs/blob/main/CHANGELOG.md#0150dev-main
• https://github.com/gogs/gogs/commit/0aa820e6d572771551871c0b5f5f32dffc565e3e
• https://github.com/gogs/gogs/pull/8391
• https://github.com/gogs/gogs/security/advisories/GHSA-3g28-2vwg-gxq6
• https://github.com/gogs/gogs/security/advisories/GHSA-3g28-2vwg-gxq6

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