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CVE-2026-74864— 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，使用了一个参数强制将携带 HTTP 请求头 "x-webobjects-remote-user" 的请求视为来自已验证用户，而无需进行密码验证。由于 Nginx 不会移除该请求头，任何客户端都可以任意提供此头部，从而无需密码即可以任何用户（包括特权用户）的身份访问系统。 该问题已在版本 5.8.0~ynh9 中修复。

CVSS 9.3 · Critical EPSS 0.41% · P33

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-2026-74864

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 that forces the request with HTTP header "x-webobjects-remote-user" to be treated as sent by a verified user without performing password validation. Since Nginx does not strip this header, any client can supply it arbitrarily and gain access as any user, including a privileged user, without providing a password. This issue was fixed in version 5.8.0~ynh9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/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-2026-74864

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III. Intelligence Information for CVE-2026-74864

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Vendor Advisories for CVE-2026-74864 (1)

Security Blog Posts for CVE-2026-74864 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-74864

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