---
cve: "CVE-2026-33758"
severity: "CRITICAL"
cvss: 9.4
epss: "29%"
vendor: "openbao"
kev: false
exploited: false
published: "2026-03-27 15:16:57"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-16T23:41:35+02:00"
---

# CVE-2026-33758

> 9.4 CRITICAL · 🧪 PoC

## Beschreibung

OpenBao is an open source identity-based secrets management system. Prior to version 2.5.2, OpenBao installations that have an OIDC/JWT authentication method enabled and a role with `callback_mode=direct` configured are vulnerable to XSS via the  `error_description` parameter on the page for a failed authentication. This allows an attacker access to the token used in the Web UI by a victim. The `error_description` parameter has been replaced with a static error message in v2.5.2. The vulnerability can be mitigated by removing any roles with `callback_mode` set to `direct`.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Patch verfügbar (OSV)

- 932fcf892eba8d646a9bfc58a59ea3b2475b17fa (Commit)
- 6e2b2dd84f0e47cebc90d6e79609dd5274732662 (Commit)

## Referenzen

- <https://github.com/openbao/openbao/security/advisories/GHSA-cpj3-3r2f-xj59>
- <https://github.com/openbao/openbao/pull/2709>
- <https://github.com/openbao/openbao/commit/6e2b2dd84f0e47cebc90d6e79609dd5274732662>
- <https://github.com/openbao/openbao/releases/tag/v2.5.2>
- <https://access.redhat.com/security/cve/CVE-2026-33758>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2452294>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33758.json>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-33758) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_