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Advisory record · GHSA-9vm7-v8wj-3fqw

keycloak-core: open redirect via "form_post.jwt" JARM response mode

CVSS 4.6 MediumEPSS 0.011 · 66th percentile

Published by the GitHub Advisory Database at 23 Jan 2024, 14:43 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-coreMaven<23.0.423.0.4
Identifiers
GHSA-9vm7-v8wj-3fqw · CVE-2023-6927
Weakness (CWE)
CWE-601
Tags
Published
23 Jan 2024
Updated
10 Sept 2026

Machine-written summary

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

Keycloak Core (org.keycloak:keycloak-core) versions before 23.0.4 are vulnerable to an open redirect through the "form_post.jwt" JARM response mode. An attacker who can get a victim to start a login flow against a client that uses a wildcard redirect URI could steal authorization codes or tokens. The source gives few details beyond the fix for CVE-2023-6134 being incomplete. Upgrade to version 23.0.4 or later.

Written 2 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
4.6 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.011, the 66th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 22 Jan 2024, 15:16 UTC Published by the maintainers as a GitHub repository advisory
  2. 31 Oct 2026, 14:18 UTC First seen by agentprime
  3. 31 Oct 2026, 14:18 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.