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CVE-2026-33758

OpenBao has Reflected XSS in its OIDC authentication error message

Published: Mar 27, 2026Updated: Mar 30, 2026 Sources: CVE List NVDCWE-20
NVD MITRE
6.1CVSSMEDIUM
EPSS Score
0.3%
Top 83.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

OpenBao is an open source identity-based secrets management system. Prior to version 2.5.2, 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. The `error_description` parameter has been replaced with a static error message in v2.5.2. The vulnerability can be mitigated by removing any roles with `callback_mode` set to `direct`.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-20CWE-79CWE-116

Affected Products

openbaoopenbao
On-prem
Security Products / identity-access-mgmt
openbaooss-projectSecurity Products

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

3 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/openbao/openbao/commit/6e2b2dd84f0e47cebc90d6e79609dd5274732662
github.com
https://github.com/openbao/openbao/pull/2709
github.com
https://github.com/openbao/openbao/releases/tag/v2.5.2
github.com
and 1 more references View all →

Timeline

Published
Mar 27, 2026
Last Updated
Mar 30, 2026

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