---
id: CVE-2026-109206
title: >-
  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
summary: >-
  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 sup…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-204
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T14:17:11.427'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109206'
references:
  - url: 'https://github.com/logicaldoc/community'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/logicaldoc/community/blob/9.3/logicaldoc-webapp/src/main/java/com/logicaldoc/web/AvatarServlet.java#L63
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/logicaldoc/community/commit/4e93a69526ae7fe50f670b85b3fc57181f3de3f7
    label: disclosure@vulncheck.com
  - url: 'https://github.com/logicaldoc/community/discussions/119'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/logicaldoc-community-edition-through-9.3-username-enumeration-via-avatarservlet
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-12T14:50:34.121Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.