CVE-2026-42206
CVE-2026-42206 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.7. 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-345.
Key facts
- Severity: Medium (CVSS 4.0 base score 5.7)
- EPSS exploit prediction: 0% (5th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-28837
- Weakness: CWE-345
- Published:
- Last modified:
Description
Roadiz is a polymorphic content management system based on a node system. Prior to versions 2.3.43, 2.5.45, 2.6.31, and 2.7.18, the roadiz/openid package generates an OIDC nonce in OAuth2LinkGenerator::generate() and includes it in the authorization request sent to the identity provider, but never stores it and never validates it on the callback. The OpenIdJwtConfigurationFactory validation chain does not include a nonce constraint, and OpenIdAuthenticator::authenticate() never checks the nonce claim in the returned ID token against a stored value. This issue has been patched in versions 2.3.43, 2.5.45, 2.6.31, and 2.7.18.
Frequently asked questions
- What is CVE-2026-42206?
- Roadiz is a polymorphic content management system based on a node system. Prior to versions 2.3.43, 2.5.45, 2.6.31, and 2.7.18, the roadiz/openid package generates an OIDC nonce in OAuth2LinkGenerator::generate() and includes it in the authorization request sent to the identity provider, but never stores it and never validates it on the callback. The OpenIdJwtConfigurationFactory validation chain does not include a nonce constraint, and OpenIdAuthenticator::authenticate() never checks the nonce claim in the returned ID token against a stored value. This issue has been patched in versions 2.3.43, 2.5.45, 2.6.31, and 2.7.18.
- How severe is CVE-2026-42206?
- CVE-2026-42206 has a CVSS 4.0 base score of 5.7, rated medium severity.
- Is CVE-2026-42206 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-42206?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-42206 have an EU (EUVD) identifier?
- Yes. CVE-2026-42206 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28837.
- When was CVE-2026-42206 published?
- CVE-2026-42206 was published on 2026-05-08 and last updated on 2026-06-17.
References
Other CWE-345 (Insufficient Verification of Data Authenticity) vulnerabilities
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