CVE-2026-110101

Medium

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.

SeverityMedium

CVSS5.4

Exploit probability—

ProductKoillection

PublishedOct 13, 2026

First seenOct 13, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Vendor advisories

github.com/benjaminjonard/koillection/releases/tag/1.8.4

Affected products

Product	Affected versions	Fixed in
benjaminjonard Koillection	v ≤ 1.8.4	—

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