CVE-2026-45551 Details
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.
A stored cross-site scripting vulnerability has been identified in Group-Office, an enterprise customer relationship management and groupware tool. This issue affects versions prior to 26.0.25, 25.0.100, and 6.8.165. The vulnerability allows low-privileged authenticated users to inject arbitrary JavaScript payloads into an administrator's email font size setting. This is achieved by exploiting a cross-user setting write capability and a client-side sink in the email module that directly injects the font size setting into JavaScript without proper escaping. When the administrator accesses the Group-Office web client, the injected JavaScript is executed, leading to a compromise of the administrator's session and unauthorized privilege escalation.
Users can update to Group-Office versions 26.0.25, 25.0.100, or 6.8.165 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 29, 2026CISA-ADP
Assessed May 29, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/Intermesh/groupoffice/security/advisories/GHSA-9w92-p32g-g99p | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/Intermesh/groupoffice/security/advisories/GHSA-9w92-p32g-g99p | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-639 | Authorization Bypass Through User-Controlled Key | [email protected] |
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| GroupOffice | 26.0.23 (semver) 25.0.99 (semver) 6.8.164 (semver) |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 21, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 29, 2026 | CVE Modified | CISA-ADP |
| May 29, 2026 | New CVE Received | [email protected] |