CVE-2026-110101 Koillection through 1.8.4 Stored XSS via Datum File Attachment Uploads
Authenticated users can upload malicious HTML files to execute JavaScript in victims' sessions, potentially leading to account takeover or data modification.
- 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-2026-110101?
CVE-2026-110101 is a medium-severity cross-site scripting vulnerability in benjaminjonard Koillection, published on 13 Oct 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
Koillection through 1.8.4 contains a stored cross-site scripting vulnerability that allows authenticated users to upload HTML files as Datum file attachments lacking MIME restrictions. Attackers can upload HTML payloads via POST /api/data/{id}/file, served as text/html from public/uploads, executing JavaScript in victims' sessions to perform actions on their behalf.
Weakness: CWE-79
Which versions are affected by CVE-2026-110101?
How do I fix CVE-2026-110101?
No fix has been published for CVE-2026-110101 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-2026-110101 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-110101 exists.
Sources
Also known as GHSA-2rcm-w8cq-6hv5.