Vulnerability · Published Oct 12, 2026 · Assigned by VulnCheck

CVE-2026-109206LogicalDOC Community Edition through 9.3 Username Enumeration via AvatarServlet

Medium 5.3

In plain English

A medium-severity security flaw in LogicalDOC Community Edition from LogicalDOC. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.2%top 83.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
LogicalDOC	LogicalDOC Community Edition	0 – through 9.3

Weakness: CWE-204 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

https://github.com/logicaldoc/community/discussions/119 technical-description
Patch Commit patch
https://github.com/logicaldoc/community/blob/9.3/logicaldoc-webapp/src/main/java/com/logicaldoc/web/AvatarServlet.java#L63 technical-description
https://github.com/logicaldoc/community product
VulnCheck Advisory: LogicalDOC Community Edition through 9.3 Username Enumeration via AvatarServlet third-party-advisory