Account impersonation via unvalidated OIDC nonce
Published May 8, 2026 · Updated May 8, 2026
Authentication bypass in Roadiz OpenID allows remote attackers with a valid ID token to impersonate its subject through token replay. OAuth2LinkGenerator::generate() sends a nonce without storing it, while the callback validation chain and OpenIdAuthenticator::authenticate() never compare the token's nonce claim with the issued value. Exploitation requires an unexpired token obtained from a legitimate flow or a malicious identity provider, and it grants authentication as the token's subject.
Summary
What happened
Authentication bypass in Roadiz OpenID allows remote attackers with a valid ID token to impersonate its subject through token replay. OAuth2LinkGenerator::generate() sends a nonce without storing it, while the callback validation chain and OpenIdAuthenticator::authenticate() never compare the token's nonce claim with the issued value. Exploitation requires an unexpired token obtained from a legitimate flow or a malicious identity provider, and it grants authentication as the token's subject.
The record
- CVE
- CVE-2026-42206
- Published
- May 8, 2026
- Updated
- May 8, 2026
- Vendor
- Roadiz
- Product
- core-bundle-dev-app
- Classifications
- CWE-345, T1550.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 8, 2026CVE publishedPublication date reported by the CVE source.
- May 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 2.3.43
- Affected versionversion=>= 2.5.0, < 2.5.45
- Affected versionversion=>= 2.6.0, < 2.6.31
- Affected versionversion=>= 2.7.0, < 2.7.18
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Vendor-published ID token replay proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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