CVE-2026-33758
March 27, 2026
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".
Affected Packages
https://github.com/openbao/openbao.git (GITHUB):
Affected version(s) >=v2.0.0-alpha20240329 <v2.5.2Fix Suggestion:
Update to version v2.5.2https://github.com/openbao/openbao.git (GITHUB):
Affected version(s) >=v2.0.0-alpha20240329 <v2.5.2Fix Suggestion:
Update to version v2.5.2github.com/openbao/openbao (GO):
Affected version(s) >=v0.0.0-20231109181733-93b1d803cb32 <v2.5.2Fix Suggestion:
Update to version v2.5.2github.com/openbao/openbao (GO):
Affected version(s) >=v0.0.0-20231109181733-93b1d803cb32 <v2.5.2Fix Suggestion:
Update to version v2.5.2Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.4
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
HIGH
CVSS v3
Base Score:
9.6
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.15
