Answer in brief
CVE-2026-33758 records a Medium severity (CVSS 6.1) vulnerability in OpenBao has Reflected XSS in its OIDC authentication error message. The current sources do not mark it as known exploited. The current feed maps openbao/openbao (generic), github.com/openbao/openbao (go). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps openbao/openbao (generic), github.com/openbao/openbao (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| openbao/openbaogeneric | < 2.5.2 | Not reported |
| github.com/openbao/openbaogo | >=0 <0.0.0-20260325133417-6e2b2dd84f0e | 0.0.0-20260325133417-6e2b2dd84f0e |
Published upstream
Mar 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 15, 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`.
Quoted source text, attributed separately from HOL analysis.