CVE-2026-33758 — CVE & Security Advisory Radar

🎯 CVE-2026-33758 CRITICAL 9.4 🔥 EPSS 29% 🧪 PoC 🇪🇺 EUVD

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CVE-2026-33758 | 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 err

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`.

Klassifikation & Betroffenheit:

openbao openbao < 2.5.2openbao openbao *

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') 🎯 High

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

🛡️ Empfohlene Mitigation: Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482]. Examples of libraries and frameworks that make it easier to generate properly encoded output include Microsoft's Anti-XSS library, the OWASP ESAPI Encoding module, and …

Vollständige Definition bei MITRE ➔

⚔️ Typische Angriffsmuster (CAPEC):

CAPEC-63 · Cross-Site Scripting (XSS) (Very High) CAPEC-85 · AJAX Footprinting (Low) CAPEC-209 · XSS Using MIME Type Mismatch (Medium) CAPEC-588 · DOM-Based XSS (Very High) CAPEC-591 · Reflected XSS (Very High) CAPEC-592 · Stored XSS (Very High)

🧩 Ähnliche Schwachstellen (Hersteller/Klasse/Score-Band):

CVE-2026-33757 9.6 CVE-2025-54997 9.1 CVE-2025-59048 8.1

🩹 Patch verfügbar (OSV):

🩹 932fcf892eba8d646a9bfc58a59ea3b2475b17fa (Commit) 🩹 6e2b2dd84f0e47cebc90d6e79609dd5274732662 (Commit)

📚 Referenzen & Quellen:

🇪🇺 Original-Eintrag (ENISA EUVD) 🇺🇸 NVD-Eintrag

Ausnutzungs-Zeitleiste:

Reserviert 2026

Veröffentlicht 03/2026

Heute 15.09.

CVSS-Vektor-Analyse: 9.4

AV · Angriffsvektor Netzwerk

AC · Komplexität Gering

PR · Privilegien Keine

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

Veröffentlicht:27.03.2026

Aktualisiert:15.07.2026 02:20

Assigner (CNA):GitHub_M

EUVD-ID:EUVD-2026-16626

Quellen: 🇪🇺 EUVD-Datenbank (ENISA) + 🇺🇸 NVD-Anreicherung · 24-h-Cache

CWE-79: Cross-Site Scripting ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Sicherheits-Update des Herstellers zeitnah einspielen und Netzwerksegmentierung prüfen.

Tier	2026-08-29	2026-09-15
≥90 %	4	0
≥50 %	4	0
≥10 %	3	0
<10 %	304	300

9.4 CRITICAL

🇪🇺 EUVD

EPSS

29%

CVE-2026-33758 🌐 Netzwerk (Remote) 🔓 Keine Authentifizierung nötig

🧪 openbao

CVE-2026-33758 | 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 err

CWE-79: Cross-Site Scripting ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Sicherheits-Update des Herstellers zeitnah einspielen und Netzwerksegmentierung prüfen.

27.03.2026

🛡️ Details ➔

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