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Advisory record · GHSA-x77v-q46j-393g

Gitea: Blind SSRF in OAuth2 avatar synchronization via unvalidated OIDC picture claim

CVSS 3.1 LowEPSS 0.0029 · 21st percentile

Published by the GitHub Advisory Database at 21 Jul 2026, 20:22 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
code.gitea.io/giteaGo<1.27.01.27.0
Identifiers
GHSA-x77v-q46j-393g · CVE-2026-23603 · GO-2026-6083
Weakness (CWE)
CWE-918
Tags
Published
21 Jul 2026
Updated
27 Jul 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Gitea versions before 1.27.0 are affected when the OAuth2 client setting UPDATE_AVATAR is enabled. A user who can control the avatar value (commonly the OIDC picture claim) from a configured OAuth2 or OIDC provider can make the Gitea server send outbound GET requests to arbitrary addresses, including internal and cloud metadata endpoints, which is a blind server-side request forgery. Upgrade to Gitea 1.27.0 or later; the source does not describe another workaround.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
3.1 Low 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.0029, the 21st percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:55 UTC First seen by agentprime
  2. 31 Oct 2026, 14:55 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.