OpenBao has Reflected XSS in its OIDC authentication error message (CVE-2026-33758)
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`.
OpenBao has Reflected XSS in its OIDC authentication error message (CVE-2026-33758)
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`.
Affected software
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Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- BIT-openbao-2026-33758
- Osv Schema Version
- 1.6.2
- Aliases
- ["CVE-2026-33758"]
- Ecosystems
- ["Bitnami"]
- Database Specific Severity
- Critical
- Cvss Version
- null
Patch Information
Threat ID: 6aa005f4acd9273b49ab6395
Added to database: 09/08/2026, 12:56:20 UTC
Last updated: 09/08/2026, 12:56:20 UTC
Views: 1
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