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Fencer Vulns
low 3.5

CVE-2026-34454 json

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

published 2026-04-14 6 mo ago modified 2026-09-08 2 mo ago also BIT-oauth2-proxy-2026-34454 , EUVD-2026-22758 , GHSA-f24x-5g9q-753f , GO-2026-5341

cvss
3.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

OAuth2 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

Patch / fix

  • go github.com/oauth2-proxy/oauth2-proxy/v7 7.15.2
  • bitnami oauth2-proxy 7.15.2
  • oauth2_proxy_project oauth2_proxy 7.15.2
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.5 CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
GitHub 3.1 3.5 CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
OSV 3.1 3.5 CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
go github.com/oauth2-proxy/oauth2-proxy/v7
>=7.11.0, <7.15.2
7.15.2
bitnami oauth2-proxy
>=7.11.0, <7.15.2
7.15.2
go github.com/oauth2-proxy/oauth2-proxy
all versions
 no fix listed

Affected products

  • oauth2-proxy oauth2-proxy

Classification

Weakness
  • CWE-613 DEPRECATED: Insufficient Session Expiration
  • CWE-384 Session Fixation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.