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CVE-2026-33758

MEDIUM

6.1

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`.

CVE Details

CVSS v3.1 Score6.1

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionREQUIRED

Published3/27/2026

Last Modified3/30/2026

Sourcenvd

Honeypot Sightings0

Affected Products

openbao:openbao

Weaknesses (CWE)

CWE-20CWE-79CWE-116

References

https://github.com/openbao/openbao/commit/6e2b2dd84f0e47cebc90d6e79609dd5274732662(security-advisories@github.com)

https://github.com/openbao/openbao/pull/2709(security-advisories@github.com)

https://github.com/openbao/openbao/releases/tag/v2.5.2(security-advisories@github.com)

https://github.com/openbao/openbao/security/advisories/GHSA-cpj3-3r2f-xj59(security-advisories@github.com)

IOC Correlations

No correlations recorded

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