CVE-2026-23887 Group-Office has stored XSS vulnerability via unsanitized filenames
Attackers can inject malicious scripts via unsanitized filenames, potentially hijacking user sessions or executing actions in the browser.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-23887?
CVE-2026-23887 is a medium-severity cross-site scripting vulnerability in Intermesh groupoffice, published on 21 Jan 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Group-Office is an enterprise customer relationship management and groupware tool. In versions 6.8.148 and below, and 25.0.1 through 25.0.79, the application stores unsanitized filenames in the database, which can lead to Stored Cross-Site Scripting (XSS). Users who interact with these specially crafted file names within the Group-Office application are affected. While the scope is limited to the file-viewing context, it could still be used to interfere with user sessions or perform unintended actions in the browser. This issue is fixed in versions 6.8.149 and 25.0.80.
Which versions are affected by CVE-2026-23887?
It affects 1 product.
Products include Group-Office Group Office.
How do I fix CVE-2026-23887?
No fix has been published for CVE-2026-23887 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-23887 being exploited?
There is no known exploitation of CVE-2026-23887 in the wild and no public exploit code.
Other vulnerabilities in Intermesh groupoffice
- CVE-2026-25512 Group-Office is vulnerable to RCE due to Command Injection via TNEF Attachment Handler
- CVE-2026-25134 Group-Office Argument Injection in MaintenanceController::actionZipLanguage
- CVE-2025-63406 Code injection in n/a
- CVE-2026-25511 Group-Office is vulnerable to SSRF and File Read in WOPI service discovery
- CVE-2023-46730 Server-Side Request Forgery in groupoffice
Sources
Also known as GHSA-3gj5-gvvr-g6hp.