How severe is CVE-2026-37982?

CVE-2026-37982 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-37982 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-37982?

CVE-2026-37982 affects Redhat Build Of Keycloak. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-37982?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-37982 have an EU (EUVD) identifier?

Yes. CVE-2026-37982 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30886.

When was CVE-2026-37982 published?

CVE-2026-37982 was published on 2026-05-19 and last updated on 2026-06-17.

CVE-2026-37982

CVE-2026-37982 is a medium-severity vulnerability in Redhat Build Of Keycloak with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-294.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30886
Weakness: CWE-294
Affected product: Redhat Build Of Keycloak
Published: 2026-05-19
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-37982?: 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.
How severe is CVE-2026-37982?: CVE-2026-37982 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-37982 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-37982?: CVE-2026-37982 affects Redhat Build Of Keycloak. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-37982?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-37982 have an EU (EUVD) identifier?: Yes. CVE-2026-37982 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30886.
When was CVE-2026-37982 published?: CVE-2026-37982 was published on 2026-05-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*

More vulnerabilities in Redhat Build Of Keycloak

CVE-2026-15572 — High (CVSS 8.8): A flaw was found in Keycloak's Dynamic Client Registration (DCR) security policy management. The "Allowed Protocol…
CVE-2026-3047 — High (CVSS 8.8): A flaw was found in org.keycloak.broker.saml. When a disabled Security Assertion Markup Language (SAML) client is…
CVE-2026-16102 — High (CVSS 8.1): A flaw was found in the Dynamic Client Registration (DCR) component of Keycloak, an identity and access management…
CVE-2026-15573 — High (CVSS 8.1): A flaw was found in Keycloak's Authorization Services. The component responsible for matching request paths to security…
CVE-2026-1609 — High (CVSS 8.1): A flaw was found in Keycloak. When the JSON Web Token (JWT) authorization grant preview feature is enabled and a user…
CVE-2026-11800 — High (CVSS 8.1): A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an…

All CVEs affecting Redhat Build Of Keycloak →

Other CWE-294 (Authentication Bypass by Capture-replay) vulnerabilities

CVE-2025-49752 — Critical (CVSS 10.0): Azure Bastion Elevation of Privilege Vulnerability
CVE-2026-68079 — Critical (CVSS 9.8): In Apache CXF's DefaultEncryptingCodeDataProvider, a captured authorization code can be redeemed an unlimited number…
CVE-2026-28564 — Critical (CVSS 9.8): Insufficient Session Expiration, Authentication Bypass by Capture-replay vulnerability in Apache IoTDB. REST Basic…
CVE-2026-11856 — Critical (CVSS 9.8): Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then…
CVE-2026-32987 — Critical (CVSS 9.8): OpenClaw before 2026.3.13 allows bootstrap setup codes to be replayed during device pairing verification in…
CVE-2025-67135 — Critical (CVSS 9.8): Weak Security in the PF-50 1.2 keyfob of PGST PG107 Alarm System 1.25.05.hf allows attackers to compromise access…

Browse all CWE-294 (Authentication Bypass by Capture-replay) vulnerabilities →