OAuth2 Proxy: Session cookie not cleared when rendering sign-in page

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Summary

CVECVE-2026-34454
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-14 23:16:28 UTC
Updated2026-04-17 15:38:09 UTC
DescriptionOAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. A regression introduced in 7.11.0 prevents OAuth2 Proxy from clearing the session cookie when rendering the sign-in page. In deployments that rely on the sign-in page as part of their logout flow, a user may be shown the sign-in page while the existing session cookie remains valid, meaning the browser session is not actually logged out. On shared workstations or devices, a subsequent user could continue to use the previous user's authenticated session. Deployments that use a dedicated logout/sign-out endpoint to terminate sessions are not affected. This issue is fixed in 7.15.2

Risk And Classification

Primary CVSS: v3.1 3.5 LOW from [email protected]

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS: 0.000080000 probability, percentile 0.007060000 (date 2026-04-21)

Problem Types: CWE-384 | CWE-613 | CWE-613 CWE-613: Insufficient Session Expiration | CWE-384 CWE-384: Session Fixation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary3.5LOWCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
3.1CNADECLARED3.5LOWCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Physical
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Oauth2-proxy Oauth2-proxy affected >= 7.11.0, < 7.15.2 Not specified

References

ReferenceSourceLinkTags
github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-f24x-5g9q-... [email protected] github.com
github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.15.2 [email protected] github.com
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