CVE-2026-33757
Description
A flaw was found in OpenBao. A missing prompt for user confirmation when logging in via the JWT/OIDC authentication method with a role configured to use callback_mode=direct allows an attacker to initiate an authentication request and perform a "remote phishing" attack by tricking an authenticated user into visiting a crafted URL, automatically logging the user into the session of the attacker.
Statement
To exploit this vulnerability, an attacker needs to convince a user to visit a crafted URL, limiting the exposure of this flaw. Due to this reason, this issue has been rated with an important severity.
Mitigation
To mitigate this vulnerability, review JWT/OIDC authentication configurations and remove or disable any roles that have 'callback_mode=direct', or enforce a manual confirmation prompt for every session specifically for the Client ID used by OpenBao.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 9.6 | 8.3 | 9.6 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | Low | Low | Low |
| Privileges Required | None | None | None |
| User Interaction | Required | Required | Required |
| Scope | Changed | Unchanged | Changed |
| Confidentiality | High | High | High |
| Integrity Impact | High | High | High |
| Availability Impact | Low | Low | Low |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
Red Hat CVSS v3 Score Explanation
Since OpenBao is a secrets management system, a successful exploit allows an attacker to pivot from the initial vulnerability into the wider infrastructure by stealing authentication tokens. To reflect this condition, the scope metric is set to changed.
Understanding the Weakness (CWE)
Access Control
Technical Impact: Gain Privileges or Assume Identity
Frequently Asked Questions
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