CVE-2025-48993Public exploitNetwork attack vector

Session hijacking via unencoded formatting values

Published Jun 17, 2025 · Updated Jun 17, 2025

Reflected XSS in GroupOffice before 6.8.123 and 25.0.27 allows remote authenticated users to execute JavaScript via formatting fields. The multiselect Field.js renderer returns a user-controlled display value without HTML encoding when rendering Look and Feel formatting data. Any account can save the payload; execution in another browser context enables session hijacking or access to sensitive data.

CVSS severity5.3
Medium
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 6.8.123 and 25.0.27 allows remote authenticated users to execute JavaScript via formatting fields. The multiselect Field.js renderer returns a user-controlled display value without HTML encoding when rendering Look and Feel formatting data. Any account can save the payload; execution in another browser context enables session hijacking or access to sensitive data.

The record

CVE
CVE-2025-48993
Published
Jun 17, 2025
Updated
Jun 17, 2025
Vendor
Intermesh BV
Product
GroupOffice
Classifications
CWE-79, T1539
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 25.0.27
  2. Affected versionversion=< 6.8.123

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Intermesh BV · GroupOfficeversion=< 25.0.27; version=< 6.8.123

Published CVSS scores

5.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1539Steal Web Session Cookie

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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