CVE-2023-34088

HighCVSS 8.7

Published: 31/05/2023(UTC)Updated: 17/06/2026(UTC)Translated: 18/06/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.40%

32th percentile - higher than 32% of all known CVEs

Summary

A stored XSS vulnerability was found in Collabora Online prior to versions 22.05.13, 21.11.9.1, and 6.4.27, allowing an attacker to inject malicious code via document names. When an administrator opened the admin console, the document name could be executed as a script, risking the leak of the JWT.

Risk Assessment

This vulnerability could lead to session hijacking of the administrator and exposure of sensitive information, posing a serious threat to organizational security.

Recommendation

It is recommended to upgrade Collabora Online to version 22.05.13 or higher, 21.11.9.1 or higher, and 6.4.27 or higher to mitigate this vulnerability.

Other vulnerabilities in Collabora Online

CVE-2025-66208Critical
Collabora Online - Built-in CODE Server (richdocumentscode) prior to 25.04.702 has a Configuration-Dependent RCE (OS Command Injection) in richdocumentscode proxy. Users of Nextcloud with Collabora Online - Built-in CODE Server app can be vulnerable to attack via proxy.php and an intermediate reverse proxy.

Original NVD description (English source)

Collabora Online is a collaborative online office suite. A stored cross-site scripting (XSS) vulnerability was found in Collabora Online prior to versions 22.05.13, 21.11.9.1, and 6.4.27. An attacker could create a document with an XSS payload as a document name. Later, if an administrator opened the admin console and navigated to the history page, the document name was injected as unescaped HTML and executed as a script inside the context of the admin console. The administrator JSON web token (JWT) used for the websocket connection could be leaked through this flaw. Users should upgrade to Collabora Online 22.05.13 or higher; Collabora Online 21.11.9.1 or higher; Collabora Online 6.4.27 or higher to receive a patch.