CVE-2026-55746 Cotonti stored XSS via PFS folder title
An authenticated user can inject malicious scripts into Personal File Storage folder titles, leading to stored XSS attacks against other users.
- 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-2026-55746?
CVE-2026-55746 is a high-severity cross-site scripting vulnerability in Cotonti, published on 18 Jun 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
Cotonti 1.0.0 (master branch, commit f43f1fc3) is vulnerable to stored Cross-Site Scripting in the Personal File Storage (PFS) module. A folder title (pff_title) is imported with the 'TXT' filter, which does not strip or encode HTML (the tag check in cot_import is disabled), so an authenticated user can store HTML/JavaScript in a folder title.
Weakness: CWE-79
Which versions are affected by CVE-2026-55746?
2 open source packages ship an affected version, including cotonti/cotonti.
| Package | Affected | Fixed in |
|---|---|---|
cotonti/cotonti Packagist | All versions to 1.0.0 | None |
cotonti/cotonti Packagist | All versions to 1.0.0 | None |
How do I fix CVE-2026-55746?
No fix has been published for CVE-2026-55746 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-2026-55746 being exploited?
There is no known exploitation of CVE-2026-55746 in the wild and no public exploit code.
Sources
Also known as GHSA-86hp-hf3j-3m8r.