CVE-2023-34088: high-severity vulnerability in CollaboraOnline online
Collabora Online has Stored Cross-Site-Scripting vulnerability in admin interface
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.4%
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Affected products
CollaboraOnline · onlineRelated CVEs — CollaboraOnline online
In the same product, most dangerous first.
CVE-2025-66208HIGHConfiguration-Dependent RCE (OS Command Injection) in richdocumentscode proxyEPSS 1.8%CVE-2021-32744CRITICALUnauthenticated attacker could gain access to currently open filesEPSS 1.1%CVE-2021-43817HIGHReflected Cross-Site-Scripting vulnerability in Collabora OnlineEPSS 0.7%CVE-2021-32745HIGHReflected Cross-Site-Scripting vulnerabilityEPSS 0.6%CVE-2025-24796MEDIUMRemote Code Execution within Collabora Online jail with Macros EnabledEPSS 0.5%CVE-2023-49788HIGHImproper handling of browser-side provided input in richdocuments path handlingEPSS 0.5%