Server-side Request Forgery (SSRF) Affecting gitea.dev/routers/web/auth package, versions <1.27.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITEADEVROUTERSWEBAUTH-18601958
- published10 Aug 2026
- disclosed21 Jul 2026
- creditUnknown
Introduced: 21 Jul 2026
CVE-2026-23603 Â (opens in a new tab)How to fix?
Upgrade gitea.dev/routers/web/auth to version 1.27.0 or higher.
Overview
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) via the oauth2UpdateAvatarIfNeed function. An attacker can cause the server to make arbitrary outbound HTTP GET requests by supplying a crafted avatar URL through the OAuth2/OIDC picture claim. This can result in unauthorized access to internal network resources, including loopback, private, or link-local addresses, potentially exposing sensitive information or interacting with internal services. This is only exploitable if OAuth2 avatar synchronization is enabled and the attacker can control their own picture claim in the authentication provider.