CVE-2026-110101
Koillection through 1.8.4 Stored XSS via Datum File Attachment Uploads
- State
- Published
- Severity
- 5.1 Medium
- Published
- Oct 13, 2026
- Updated
- Oct 16, 2026
- Reserved
- Oct 13, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N | VulnCheck |
| 3.1 | 5.4 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
Koillectionbenjaminjonard |
|
References
- https://github.com/benjaminjonard/koillection/issues/1609issue-trackingtechnical-description
- https://github.com/benjaminjonard/koillection/blob/1.8.4/src/Service/ImageHandler.php#L43-L50technical-description
- https://github.com/benjaminjonard/koillection/blob/1.8.4/src/Entity/Datum.php#L141-L145technical-description
- Koillection 1.8.4 Release Notesrelease-notes
- VulnCheck Advisory: Koillection through 1.8.4 Stored XSS via Datum File Attachment Uploadsthird-party-advisory
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.