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CVE

CVE-2026-33758

OpenBao has Reflected XSS in its OIDC authentication error message
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CVE

CVE-2026-33758

OpenBao has Reflected XSS in its OIDC authentication error message

Impact

OpenBao installations that have an OIDC/JWT authentication method enabled and a role with callback_mode=direct configured are vulnerable to XSS via the  error_description parameter on the page for a failed authentication.

This allows an attacker access to the token used in the Web UI by a victim.

Patches

The error_description parameter has been replaced with a static error message in v2.5.2

Workarounds

The vulnerability can be mitigated by removing any roles with callback_mode set to direct.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
-
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/openbao/openbao/security/advisories/GHSA-cpj3-3r2f-xj59, https://github.com/openbao/openbao/pull/2709, https://github.com/openbao/openbao/commit/6e2b2dd84f0e47cebc90d6e79609dd5274732662, https://github.com/openbao/openbao, https://github.com/openbao/openbao/releases/tag/v2.5.2

Severity

0

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
0
EPSS Probability
0%
EPSS Percentile
0%
Introduced Version
0
Fix Available
0.0.0-20260325133417-6e2b2dd84f0e

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