CVE-2026-45551

Group-Office: Authenticated Stored XSS in Administrator Context via Arbitrary Cross-User Setting Write

State: Published
Severity: 5.1 Medium
Published: May 29, 2026
Updated: May 29, 2026
Reserved: May 12, 2026

Description

Group-Office is an enterprise customer relationship management and groupware tool. Prior to 26.0.25, 25.0.100, and 6.8.165, GroupOffice allows authenticated users to persist arbitrary legacy settings for any user_id via index.php?r=core/saveSetting. A separate client-side sink in the email module injects the email_font_size setting directly into JavaScript without escaping. By combining these two issues, any low-privileged authenticated user can overwrite an administrator's email_font_size setting with a JavaScript payload and trigger stored XSS in the administrator's browser when the GroupOffice web client loads views/Extjs3/modulescripts.php. This vulnerability is fixed in 26.0.25, 25.0.100, and 6.8.165.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N	GitHub_M

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-639 Authorization Bypass Through User-Controlled Key

Affected Products

Product	Versions
groupofficeIntermesh	>= 26.0.1, < 26.0.25Affected >= 25.0.1, < 25.0.1005Affected < 6.8.165Affected

References

https://github.com/Intermesh/groupoffice/security/advisories/GHSA-9w92-p32g-g99p

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