CVE-2026-110101
Koillection through 1.8.4 Stored XSS via Datum File Attachment Uploads
CVSS Score
5.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | benjaminjonard |
| Product | koillection |
| Published | Oct 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
benjaminjonard / Koillection
0 ≤ 1.8.4
References
github.com: https://github.com/benjaminjonard/koillection/issues/1609 github.com: https://github.com/benjaminjonard/koillection/blob/1.8.4/src/Service/ImageHandler.php#L43-L50 github.com: https://github.com/benjaminjonard/koillection/blob/1.8.4/src/Entity/Datum.php#L141-L145 github.com: https://github.com/benjaminjonard/koillection/releases/tag/1.8.4 vulncheck.com: https://www.vulncheck.com/advisories/koillection-through-1.8.4-stored-xss-via-datum-file-attachment-uploads
Credits
Miraziz Kuchkarov (VOID) 9Insomnie