CVE-2026-109206

LogicalDOC Community Edition through 9.3 contains a username enumeration vulnerability that allows unauthenticated attackers to identify valid accounts because the AvatarServlet (/avatar) performs no session validation. Attackers can supply usernames or numeric IDs in the userId parameter and compare 1x1 transparent images against real avatars to enumerate users and retrieve profile pictures.

CVSS 4.0

6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

0.2% chance of exploitation in the next 30 days; higher than 15% of CVEs (scores of 2026-10-25)

CWE

CWE-204

Published

2026-10-12

Modified

2026-10-13

Record from

the NVD, synced 2026-10-19

References

• https://github.com/logicaldoc/community
• https://github.com/logicaldoc/community/blob/9.3/logicaldoc-webapp/src/main/java/com/logicaldoc/web/AvatarServlet.java#L63
• https://github.com/logicaldoc/community/commit/4e93a69526ae7fe50f670b85b3fc57181f3de3f7
• https://github.com/logicaldoc/community/discussions/119
• https://www.vulncheck.com/advisories/logicaldoc-community-edition-through-9.3-username-enumeration-via-avatarservlet

Check your stackJSON