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TI-2026-22291 Aliases CVE-2026-27947

Group-Office Vulnerable to Remote Code Execution (RCE)

Priority MEDIUM 44CWE-434Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-434.

Summary

Group-Office is an enterprise customer relationship management and groupware tool. Versions prior to 26.0.9, 25.0.87, and 6.8.154 have an authenticated Remote Code Execution vulnerability in the TNEF attachment processing flow. The vulnerable path extracts attacker-controlled files from `winmail.dat` and then invokes `zip` with a shell wildcard (`*`). Because extracted filenames are attacker-controlled, they can be interpreted as `zip` options and lead to arbitrary command execution. Versions 26.0.9, 25.0.87, and 6.8.154 fix the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.008 56th percentileScored 2026-11-07
Fix Fixed groupoffice (Intermesh): 26.0.9, 25.0.87, 6.8.154

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Intermeshgroupoffice26.0.0 to before 26.0.9; 25.0.0 to before 25.0.87; before 6.8.15426.0.9, 25.0.87, 6.8.154Patch availableCNA
  • groupoffice VendorIntermesh Affected 26.0.0 to before 26.0.9; 25.0.0 to before 25.0.87; before 6.8.154 Fixed in 26.0.9, 25.0.87, 6.8.154 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:intermesh:group-office:*:*:*:*:*:*:*:*before 6.8.154; 25.0.1 to before 25.0.87; 26.0.1 to before 26.0.9VulnerableIntermesh
  • cpe:2.3:a:intermesh:group-office:*:*:*:*:*:*:*:* Versions before 6.8.154; 25.0.1 to before 25.0.87; 26.0.1 to before 26.0.9 Vulnerable ·Intermesh

Remediation

  • Fix · CNA groupoffice (Intermesh) Fixed in 26.0.9, 25.0.87, 6.8.154

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27947

References

Advisory 1

  • TI-2025-30692 GroupOffice's Blind Stored XSS in Phone Number Field Enables Forced Redirect and Unauthorized Actions CVSS 4.0MEDIUM 6.9
  • TI-2025-30694 GroupOffice's DOM-Based XSS in all Date Input Fields Allows Arbitrary JavaScript Execution CVSS 4.0MEDIUM 5.8
  • TI-2025-31121 Group-Office vulnerable to reflected XSS via Look and Feel Formatting input CVSS 4.0MEDIUM 5.3
  • TI-2025-31120 Group-Office vulnerable to blind XSS CVSS 4.0MEDIUM 5.2
  • TI-2025-30695 GroupOffice vulnerable to Stored XSS in Tasks Comment Section CVSS 4.0MEDIUM 5.3
  • TI-2026-23471 Group-Office: Reflected XSS in JavaScript context CVSS 4.0MEDIUM 5.1
See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences