CVE-2023-34088: Collabora Online has Stored Cross-Site-Scripting vulnerability in admin interface

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-05-31 · updated 2026-06-17
Weakness: CWE-79

Description

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; from 21.0 before 21.11.9.1; from 22.0 before 22.05.13 — fixed in 21.11.9.1, 22.05.13, 6.4.27

How to fix

Upgrade to a fixed version: Collaboraoffice Collabora Online 21.11.9.1, 22.05.13, 6.4.27. Check the vendor advisory for mitigations.

References

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