Session reuse via uncleared sign-in cookie
Published Apr 14, 2026 · Updated Apr 14, 2026
Insufficient session expiration in OAuth2 Proxy 7.11.0 through 7.15.1 allows physically proximate attackers to reuse authenticated sessions. The SignInPage handler renders the sign-in page without calling the session store's cookie-clearing operation, leaving the prior authentication cookie valid. Exploitation requires a deployment that treats the sign-in page as logout and later physical access to the same browser or shared device; dedicated sign-out flows are unaffected.
Summary
What happened
Insufficient session expiration in OAuth2 Proxy 7.11.0 through 7.15.1 allows physically proximate attackers to reuse authenticated sessions. The SignInPage handler renders the sign-in page without calling the session store's cookie-clearing operation, leaving the prior authentication cookie valid. Exploitation requires a deployment that treats the sign-in page as logout and later physical access to the same browser or shared device; dedicated sign-out flows are unaffected.
The record
- CVE
- CVE-2026-34454
- Published
- Apr 14, 2026
- Updated
- Apr 14, 2026
- Vendor
- OAuth2 Proxy
- Product
- OAuth2 Proxy
- Classifications
- CWE-384, CWE-613, T1550.004
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 14, 2026CVE publishedPublication date reported by the CVE source.
- Apr 14, 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=>= 7.11.0, < 7.15.2
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
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Technologies
Your stack
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Your stack
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