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CVE-2026-33758— OpenBao has Reflected XSS in its OIDC authentication error message

Quick assessment

Affected
openbao openbao
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenBao是OpenBao开源的一个敏感数据管理软件。 OpenBao 2.5.2之前版本存在安全漏洞，该漏洞源于身份验证失败页面上的error_description参数存在跨站脚本，可能导致攻击者访问受害者在Web UI中使用的令牌。

AI Predicted 6.1 Difficulty: Moderate EPSS 0.45% · P37

Affected Version Matrix 1

VendorProduct Version RangeStatus
openbao openbao < 2.5.2 affected
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I. Basic Information for CVE-2026-33758

Vulnerability Information
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Vulnerability Title
OpenBao has Reflected XSS in its OIDC authentication error message
Source: CVE Program / CVE List V5
Vulnerability 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`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
OpenBao 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenBao是OpenBao开源的一个敏感数据管理软件。 OpenBao 2.5.2之前版本存在安全漏洞，该漏洞源于身份验证失败页面上的error_description参数存在跨站脚本，可能导致攻击者访问受害者在Web UI中使用的令牌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
openbao openbao < 2.5.2 -

II. Public POCs for CVE-2026-33758

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III. Intelligence Information for CVE-2026-33758

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Patches & Fixes for CVE-2026-33758 (2)

Vendor Advisories for CVE-2026-33758 (1)

Vendor Pages for CVE-2026-33758 (1)

IV. Related Vulnerabilities

Same product: openbao
Same vendor: openbao
Same weakness: CWE-20

V. Comments for CVE-2026-33758

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