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CVE-2026-33757— OpenBao lacks user confirmation for OIDC direct callback mode

Quick assessment

Affected
openbao openbao
Exploitation
Public or AI PoC available; prioritize validation
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之前版本存在授权问题漏洞，该漏洞源于通过JWT/OIDC登录且角色callback_mode设置为direct时未提示用户确认，可能导致远程钓鱼攻击。

CVSS 9.6 · Critical EPSS 0.61% · P47

Affected Version Matrix 1

VendorProduct Version RangeStatus
openbao openbao < 2.5.2 affected
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I. Basic Information for CVE-2026-33757

Vulnerability Information
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Vulnerability Title
OpenBao lacks user confirmation for OIDC direct callback mode
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 does not prompt for user confirmation when logging in via JWT/OIDC and a role with `callback_mode` set to `direct`. This allows an attacker to start an authentication request and perform "remote phishing" by having the victim visit the URL and automatically log-in to the session of the attacker. Despite being based on the authorization code flow, the `direct` mode calls back directly to the API and allows an attacker to poll for an OpenBao token until it is issued. Version 2.5.2 includes an additional confirmation screen for `direct` type logins that requires manual user interaction in order to finish the authentication. This issue can be worked around either by removing any roles with `callback_mode=direct` or enforcing confirmation for every session on the token issuer side for the Client ID used by OpenBao.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
会话固定
Source: CVE Program / CVE List V5
Vulnerability Title
OpenBao 授权问题漏洞
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之前版本存在授权问题漏洞，该漏洞源于通过JWT/OIDC登录且角色callback_mode设置为direct时未提示用户确认，可能导致远程钓鱼攻击。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
openbao openbao < 2.5.2 -

II. Public POCs for CVE-2026-33757

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Qwen3.6-35B-A3B · 8796 chars
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III. Intelligence Information for CVE-2026-33757

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Patches & Fixes for CVE-2026-33757 (1)

Vendor Advisories for CVE-2026-33757 (1)

IV. Related Vulnerabilities

Same product: openbao
Same vendor: openbao
Same weakness: CWE-384

V. Comments for CVE-2026-33757

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