CVE-2026-37982Keycloak: org.keycloak.authentication: keycloak: unauthorized account takeover via webauthn token replay
- 6.8MediumCVSS base score
- 0.44%Exploitation in 30 daysEPSS · top 61% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A flaw was found in Keycloak. This authentication vulnerability allows a remote attacker to replay `ExecuteActionsActionToken` tokens within Keycloak's WebAuthn (Web Authentication) flow. By intercepting an execute-actions email link, an attacker can register their own authenticator to a victim's account. This leads to unauthorized enrollment of a hardware-backed credential, enabling persistent account takeover.
Timeline
ID reserved
By redhat
- 43 days later
· 43 days later
Published
- 5 months later
· 5 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.1 | Medium6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
| NVDNVD · Modified | 3.1 | Medium6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.44% · top 61% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.8.
Affected products
Red Hat · Red Hat build of Keycloak 26.4
- unaffected 26.4.12-1 – < *
Red Hat · Red Hat build of Keycloak 26.4
- unaffected 26.4-17 – < *
Red Hat · Red Hat build of Keycloak 26.4
- unaffected 26.4-17 – < *
Red Hat · Red Hat build of Keycloak 26.4.12
All versions: unaffected
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Mavenorg.keycloak:keycloak-servicesGHSA-w4p5-rfh6-cwrv (opens in a new tab)
What to do
Workaround: To mitigate this issue, consider disabling WebAuthn required actions in Keycloak if they are not essential for your deployment. This will prevent the vulnerable token replay mechanism from being exploited. Consult Keycloak documentation for specific configuration steps to disable WebAuthn required actions. Note that applying configuration changes may require a service restart and could impact functionality relying on WebAuthn registration.
References
References4
- RHSA-2026:19596 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:19597 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-37982 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2455329 (opens in a new tab)issue-trackingx_refsource_REDHAT
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-30886 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-w4p5-rfh6-cwrv (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-37982)Record last updated .