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

Quick assessment

Affected
LogicalDOC LogicalDOC Community Edition
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LogicalDOC Community Edition 9.3 及之前版本存在一个用户名枚举漏洞，允许未经身份验证的攻击者识别有效账户。该漏洞的原因是 AvatarServlet（路径为 /avatar）未进行会话验证。攻击者可以在 userId 参数中提供用户名或数字 ID，并通过将 1x1 透明图像与真实头像进行比对来枚举用户并获取其个人资料图片。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1087.004 · Cloud Account

Affected Version Matrix 1

VendorProduct Version RangeStatus
LogicalDOC LogicalDOC Community Edition ≤ 9.3 affected
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I. Basic Information for CVE-2026-109206

Vulnerability Information
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Vulnerability Title
LogicalDOC Community Edition through 9.3 Username Enumeration via AvatarServlet
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
响应差异性信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
LogicalDOC LogicalDOC Community Edition 0 ~ 9.3 -

II. Public POCs for CVE-2026-109206

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III. Intelligence Information for CVE-2026-109206

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Patches & Fixes for CVE-2026-109206 (2)

Vendor Advisories for CVE-2026-109206 (1)

Vendor Pages for CVE-2026-109206 (1)

Other References for CVE-2026-109206 (1)

Same Patch Batch · LogicalDOC · 2026-10-12 · 10 CVEs total

CVE-2026-109199 8.8 HIGH LogicalDOC Community Edition through 9.3 Code Injection via Velocity sendAsEmail Template
CVE-2026-109201 8.3 HIGH LogicalDOC Community Edition through 9.3 Missing Authorization in DocumentService
CVE-2026-109205 7.5 HIGH LogicalDOC Community Edition through 9.3 Unauthenticated Upload Disk Exhaustion via Upload
CVE-2026-109170 6.5 MEDIUM LogicalDOC Community Edition through 9.3 HQL Injection via documents.xml indexed Parameter
CVE-2026-109169 6.5 MEDIUM LogicalDOC Community Edition through 9.3 SQL Injection via tags.xml firstLetter
CVE-2026-109202 6.5 MEDIUM LogicalDOC Community Edition through 9.3 Missing Authorization via zip-export Servlet
CVE-2026-109203 6.5 MEDIUM LogicalDOC Community Edition through 9.3 Missing Authorization via ConvertPdf Servlet
CVE-2026-109200 6.4 MEDIUM LogicalDOC Community Edition through 9.3 SSRF via XMLConverter xml-stylesheet href
CVE-2026-109204 6.3 MEDIUM LogicalDOC Community Edition through 9.3 Forced Password Reset via Unbound PswRecovery Tic

IV. Related Vulnerabilities

Same product: LogicalDOC Community Edition
Same vendor: LogicalDOC
Same weakness: CWE-204

V. Comments for CVE-2026-109206

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