---
id: CVE-2026-33757
aliases:
  - GHSA-7q7g-x6vg-xpc3
  - BIT-openbao-2026-33757
  - GO-2026-4860
title: OpenBao lacks user confirmation for OIDC direct callback mode
summary: OpenBao lacks user confirmation for OIDC direct callback mode
severity: critical
cvss: 9.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L'
vendor: openbao
product: github.com/openbao/openbao
ecosystem: go
affected:
  - github.com/openbao/openbao < 0.0.0-20260325142553-e32103951925
patched:
  - github.com/openbao/openbao 0.0.0-20260325142553-e32103951925
published: '2026-03-26'
updated: '2026-07-27'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-7q7g-x6vg-xpc3'
references:
  - url: 'https://github.com/openbao/openbao/security/advisories/GHSA-7q7g-x6vg-xpc3'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-33757'
  - url: >-
      https://github.com/openbao/openbao/commit/e32103951925723e9787e33886ab6b6ec20f4964
  - url: 'https://datatracker.ietf.org/doc/html/rfc8628#section-5.4'
  - url: 'https://github.com/openbao/openbao'
tags:
  - osv
  - go
epss: 0.00606
epssPercentile: 0.4669
ingestedAt: '2026-07-27T19:08:54.215Z'
---

## Overview

### Impact

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.

### Patches
Version 2.5.2 includes an additional confirmation screen for `direct` type logins that requires manual user interaction in order to finish the authentication.

### Workarounds
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.

## Affected packages

- `github.com/openbao/openbao < 0.0.0-20260325142553-e32103951925`

## Remediation

Upgrade to a patched release:

- `github.com/openbao/openbao 0.0.0-20260325142553-e32103951925`