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CVE-2026-74865— Authentication Bypass in sogo_yhn

Quick assessment

Affected
YunoHost-Apps sogo_yhn
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.

sogo_yhn 在配置 SOGo 时使用了参数 "SOGoTrustProxyAuthentication=YES"。这会导致在 HTTP Basic 认证过程中绕过密码验证。未认证的攻击者只需提供现有用户的用户名以及任意密码，即可成功登录该用户账户。 此问题已在版本 5.8.0~ynh9 中修复。

CVSS 9.2 · Critical EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
YunoHost-Apps sogo_yhn < 5.8.0~ynh9 affected
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I. Basic Information for CVE-2026-74865

Vulnerability Information
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Vulnerability Title
Authentication Bypass in sogo_yhn
Source: CVE Program / CVE List V5
Vulnerability Description
sogo_yhn configures SOGo with a parameter "SOGoTrustProxyAuthentication=YES". This causes the password to be bypassed during HTTP Basic authentication. An unauthenticated attacker who provides the username of an existing user and any arbitrary password can successfully log in to that user's account. This issue was fixed in version 5.8.0~ynh9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
YunoHost-Apps sogo_yhn 0 ~ 5.8.0~ynh9 -

II. Public POCs for CVE-2026-74865

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-74865

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Vendor Advisories for CVE-2026-74865 (1)

Security Blog Posts for CVE-2026-74865 (1)

IV. Related Vulnerabilities

Same product: sogo_yhn
Same vendor: YunoHost-Apps
Same weakness: CWE-639

V. Comments for CVE-2026-74865

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