What is the CVSS score of CVE-2026-30238?

CVE-2026-30238 has a CVSS 3.1 base score of 6.1 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Group Office are affected by CVE-2026-30238?

Organizations using Group-Office should be aware of moderate risk from CVE-2026-30238, a cross-site scripting vulnerability rated CVSS 6.1.

Is there a public PoC exploit available for CVE-2026-30238?

Yes, a public proof-of-concept exploit is available for CVE-2026-30238. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-30238?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Group Office CVE-2026-30238

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-03-06 security-advisories@github.com

XSS Group Office Intermesh

6.1

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.1 MEDIUM

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:06 vuln.today

PoC Detected

Mar 11, 2026 - 13:32 vuln.today

Public exploit code

CVE Published

Mar 06, 2026 - 22:16 nvd

MEDIUM 6.1

DescriptionGitHub Advisory

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.

AnalysisAI

Reflected cross-site scripting in GroupOffice versions before 6.8.155, 25.0.88, and 26.0.10 allows unauthenticated attackers to execute arbitrary JavaScript in a victim's browser by injecting malicious code through the Base64-encoded f parameter. The vulnerability exists in the external/index flow where user input is decoded and inserted into inline JavaScript without proper sanitization. Public exploit code exists for this vulnerability.

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Group-Office. 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

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.