CVE-2023-34088: Collaboraoffice Collabora Online

Medium severity, CVSS 5.4. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Collaboraoffice Collabora Online: before 6.4.27 (fixed in 6.4.27); from 21.0, before 21.11.9.1 (fixed in 21.11.9.1); from 22.0, before 22.05.13 (fixed in 22.05.13)

Published 2023-05-31. Last modified 2026-06-17.