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Advisory record · GHSA-rr5q-3xwr-f323

Keycloak Vulnerable to Improper Validation of Specified Quantity in Input

CVSS 6.8 MediumEPSS 0.0032 · 25th percentile

Published by the GitHub Advisory Database at 27 May 2026, 15:33 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-server-spi-privateMaven<26.6.326.6.3
org.keycloak:keycloak-servicesMaven<26.6.326.6.3
Identifiers
GHSA-rr5q-3xwr-f323 · CVE-2026-9704
Weakness (CWE)
CWE-1284
Tags
Published
27 May 2026
Updated
1 Jul 2026

Machine-written summary

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

Keycloak packages org.keycloak:keycloak-server-spi-private and org.keycloak:keycloak-services before 26.6.3 are vulnerable. An authenticated user with low privileges can send an oversized subject_token JWT to the token endpoint, which is silently dropped so the system falls back to client credentials, letting the user gain the permissions of the client's service account. Upgrade both packages to 26.6.3.

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
6.8 Medium 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0032, the 25th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:20 UTC First seen by agentprime
  2. 31 Oct 2026, 14:20 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.