---
cve: "CVE-2026-33757"
severity: "CRITICAL"
cvss: 9.6
epss: "41%"
vendor: "openbao"
kev: false
exploited: false
published: "2026-03-27 15:16:57"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-16T12:48:35+02:00"
---

# CVE-2026-33757

> 9.6 CRITICAL · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Erforderlich | good |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- 932fcf892eba8d646a9bfc58a59ea3b2475b17fa (Commit)
- e32103951925723e9787e33886ab6b6ec20f4964 (Commit)

## Referenzen

- <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>
- <https://access.redhat.com/security/cve/CVE-2026-33757>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2452269>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33757.json>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-33757) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_