CVE-2026-30238
Reflected XSS in Group-Office External Index Allows Script Injection
Publication date: 2026-03-06
Last updated on: 2026-03-11
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| intermesh | group-office | to 6.8.155 (exc) |
| intermesh | group-office | From 25.0.1 (inc) to 25.0.88 (exc) |
| intermesh | group-office | From 25.2.1 (inc) to 26.0.10 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a reflected Cross-Site Scripting (XSS) issue in Group-Office, an enterprise customer relationship management and groupware tool. It occurs in the external/index flow where the 'f' parameter, which is a Base64 encoded JSON, is decoded and then injected into an inline JavaScript block without proper escaping. This allows an attacker to inject malicious script tags (e.g., </script><script>...</script>) that execute arbitrary JavaScript code in the victim's browser.
The vulnerability affects versions prior to 6.8.155, 25.0.88, and 26.0.10 and has been patched in these versions.
How can this vulnerability impact me? :
This reflected XSS vulnerability can allow attackers to execute arbitrary JavaScript in the context of the victim's browser. This can lead to several impacts including theft of sensitive information such as cookies or session tokens, performing actions on behalf of the user without their consent, or redirecting the user to malicious websites.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, upgrade Group-Office to one of the patched versions: 6.8.155, 25.0.88, or 26.0.10.