CVE-2026-30238Public exploitNetwork attack vector

Reflected XSS via unescaped inline JavaScript

Published Mar 6, 2026 · Updated Mar 6, 2026

Reflected XSS in GroupOffice before 6.8.155, 25.0.88, and 26.0.10 allows remote attackers to run JavaScript in a victim's browser. ExternalController decodes Base64 JSON from the f parameter, and external.php inserts its fields into an inline script while validating the function against the wrong variable. No account is required, but a victim must open the crafted link; successful execution can read data available to the web context or perform actions as the victim.

CVSS severity5.1
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in GroupOffice before 6.8.155, 25.0.88, and 26.0.10 allows remote attackers to run JavaScript in a victim's browser. ExternalController decodes Base64 JSON from the f parameter, and external.php inserts its fields into an inline script while validating the function against the wrong variable. No account is required, but a victim must open the crafted link; successful execution can read data available to the web context or perform actions as the victim.

The record

CVE
CVE-2026-30238
Published
Mar 6, 2026
Updated
Mar 6, 2026
Vendor
Intermesh BV
Product
GroupOffice
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 25.0.88
  2. Affected versionversion=< 26.0.10
  3. Affected versionversion=< 6.8.155

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Intermesh BV · GroupOfficeversion=< 25.0.88; version=< 26.0.10; version=< 6.8.155

Published CVSS scores

5.1GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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