CVE-2026-30237Public exploitNetwork attack vector

Browser script execution via unescaped license input

Published Mar 6, 2026 · Updated Mar 6, 2026

Reflected XSS in GroupOffice before 6.8.155, 25.0.88, or 26.0.10 allows remote attackers to execute script in an installer's browser. The install/license.php view places the POST license field directly inside a textarea without HTML encoding, so a closing textarea tag creates a script element. The installer must remain unlocked and a user must submit attacker-controlled license text, limiting impact to browser-context data access and actions.

CVSS severity2.1
Low
EPSS probability0.23%
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, or 26.0.10 allows remote attackers to execute script in an installer's browser. The install/license.php view places the POST license field directly inside a textarea without HTML encoding, so a closing textarea tag creates a script element. The installer must remain unlocked and a user must submit attacker-controlled license text, limiting impact to browser-context data access and actions.

The record

CVE
CVE-2026-30237
Published
Mar 6, 2026
Updated
Mar 6, 2026
Vendor
Intermesh BV
Product
GroupOffice
Classifications
CWE-79, T1203
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

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
2.1GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/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.

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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')
T1203Exploitation for Client Execution

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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