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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 5
https://github.com/benjaminjonard/koillection/blob/1.8.4/src/Entity/Datum.php#L…
disclosure@vulncheck.com
https://github.com/benjaminjonard/koillection/blob/1.8.4/src/Service/ImageHandl…
disclosure@vulncheck.com
https://github.com/benjaminjonard/koillection/issues/1609
disclosure@vulncheck.com
https://github.com/benjaminjonard/koillection/releases/tag/1.8.4
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/koillection-through-1.8.4-stored-xss-via-d…
disclosure@vulncheck.com