CVE-2026-33758— OpenBao has Reflected XSS in its OIDC authentication error message
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2026-33758
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- Release v2.5.2 · openbao/openbao · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-33758
IV. Related Vulnerabilities
Same product: openbao
- CVE-2026-40264
OpenBao's Token Store Allows Cross-Namespace Renewal, Revoca - CVE-2026-39396
OpenBao has Decompression Bomb via Unbounded Copy in OCI Plu - CVE-2026-39388
OpenBao's Certificate Authentication Allows Token Renewal Wi - CVE-2026-39946
OpenBao allows SQL Injection in PostgreSQL database secrets - CVE-2026-33757
OpenBao lacks user confirmation for OIDC direct callback mod
Same vendor: openbao
- CVE-2026-40264
OpenBao's Token Store Allows Cross-Namespace Renewal, Revoca - CVE-2026-39396
OpenBao has Decompression Bomb via Unbounded Copy in OCI Plu - CVE-2026-39388
OpenBao's Certificate Authentication Allows Token Renewal Wi - CVE-2026-39946
OpenBao allows SQL Injection in PostgreSQL database secrets - CVE-2026-33757
OpenBao lacks user confirmation for OIDC direct callback mod
Same weakness: CWE-20
V. Comments for CVE-2026-33758
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