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CVE-2026-9794 Build of Keycloak

Affected softwareBuild of Keycloak
Severity5.3 Medium CVSS 3.1
Fixed in26.6.3
WeaknessCWE-209
Published28 May 2026
Updated26 Oct 2026

Description

A flaw was found in Keycloak. A remote, unauthenticated attacker can exploit this vulnerability by sending specially crafted SOAP requests to the SAML ECP (Security Assertion Markup Language Enhanced Client or Proxy) endpoint with varying client IDs. By observing distinct faultstrings in the responses, the attacker can determine the client's protocol type, leading to information disclosure.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. The 1 repository below are public GitHub repositories with fewer than 5 stars.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC 1 indexed, none at 5+ stars
  • EPSS 0.44% chance in 30 days

1 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

IndexArtifactStarsFirst seen
GitHub PoC CVE-2026-9794 — Keycloak SAML ECP client enumeration vulnerability research 2026-05-07

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: keycloak/keycloak #49684.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Medium or Low severity, no CISA or VulnCheck KEV listing, no PoC clearing the evidence bar, no CISA verdict, no Oracle advisory
Finding This CVE is MEDIUM severity, is not listed in CISA KEV or VulnCheck KEV, has no public exploit or PoC in any indexed source, carries no CISA Vulnrichment finding of a demonstrated exploit, and is not part of an Oracle Critical Patch Update. None of the signals that would put it in front of an engineer is present, and the volume of CVEs below that bar is too great to take one at a time, so no rule is written for it. This is a decision about what we act on, not a finding that the CVE is harmless — a patch may well be derivable, and a low-severity defect can still be one link in a longer chain.
Candidate fix https://bugzilla.redhat.com/show_bug.cgi?id=2482461 : a Red Hat bug: the triage, which links onward to the fix

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.keycloak:keycloak-services 0 none 26.4.7
org.keycloak:keycloak-services 26.5.0 26.6.3 unbounded

Products and versions

2 products, 3 version entries
SourceVendorProductSchemeAffected versions
osv org.keycloak keycloak-services generic ≤ 26.4.7 · ≥ 26.5.0 and < 26.6.3
nvd redhat build of keycloak generic any version

References

URLTags
https://bugzilla.redhat.com/show_bug.cgi?id=2482461 bugzilla
https://github.com/keycloak/keycloak/issues/49428 WEB
https://github.com/keycloak/keycloak/pull/49684 WEB
https://github.com/keycloak/keycloak/pull/49686 WEB
https://github.com/keycloak/keycloak/commit/05e98366773eec60878bb2a6d5da6bc7048ac3c8 WEB
https://github.com/keycloak/keycloak/commit/7750e3ff823d1da8580d42c51194feb2e933b87b WEB
https://github.com/keycloak/keycloak/commit/dba79eb03fb9d634fda5e86e1613b8747f968518 WEB
https://access.redhat.com/errata/RHSA-2026:25097 WEB
https://access.redhat.com/errata/RHSA-2026:25098 WEB
https://access.redhat.com/errata/RHSA-2026:30049 WEB

Timeline

Published2026-05-28By the CVE Program.
NVD record modified2026-10-26NVD's own last-modified date for this record.