XSS in Intermesh Group-Office
CVE-2026-30238
Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.155, 25.0.88, and 26.0.10, there is a reflected XSS vulnerability in GroupOffice on the external/index flow. The f parameter (Base64 JSON) is decoded and then injected into an inline JavaScript block without strict escaping, allowing </script><script>...</script> injection and arbitrary JavaScript execution in the victim's browser. This issue has been patched in versions 6.8.155, 25.0.88, and 26.0.10.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (24.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 24.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Intermesh Group-Office
- Intermesh Groupoffice — versions < 6.8.155, < 25.0.88, < 26.0.10
Weakness classification (CWE)
References
- github.com/Intermesh/groupoffice/security/advisories/GHSA-7p2f-c33m-rv5v (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-30238?
- CVE-2026-30238 is a medium-severity vulnerability in Intermesh Group-Office, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-03-06.
- How severe is CVE-2026-30238?
- Medium severity. CVSS v3 base score is 6.1 out of 10.