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TI-2018-16194 Aliases CVE-2018-25438GHSA-vvmf-fxj8-j775

Path traversal in Intermesh Group-Office lets attackers read files

Priority HIGH 77CWE-22Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-22 and the CVSS impact.

Summary

Intermesh Group-Office from 3.3.0 before 3.5.5 contains a path traversal flaw in compress.php (CWE-22). An unauthenticated remote attacker can manipulate the file parameter to read arbitrary files on the server, such as /etc/passwd. The Shadowserver Foundation first observed exploitation on 2023-10-21.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Intermesh Group-Office 3.3.0 before 3.5.5 contains an unauthenticated path traversal vulnerability in compress.php that allows remote attackers to read arbitrary files by manipulating the 'file' parameter. Attackers can send GET requests to /compress.php with '../' sequences in the 'file' parameter, which is appended to the cache path and passed to readfile(), to read files such as /etc/passwd. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-10-21.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00536 45th percentileScored 2026-11-07
Fix Fixed Group-Office (Intermesh): 3.5.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
IntermeshGroup-Office3.3.0 to before 3.5.53.5.5Patch availableCNA
  • Group-Office VendorIntermesh Affected 3.3.0 to before 3.5.5 Fixed in 3.5.5 Patch available CNA

Remediation

Intermesh Group-Office 3.5.5 fixes this flaw. The sources list no advisory identifier for the fix.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Group-Office (Intermesh) Fixed in 3.5.5

Timeline

  1. 2026-10-22 Threatist record created from CVE-2018-25438
  2. 2026-10-22 Alias added: GHSA-vvmf-fxj8-j775
  3. 2026-10-23 Priority changed: MEDIUM → LOW
  4. 2026-10-28 CISA SSVC decision points changed
  5. 2026-10-28 Priority changed: LOW → HIGH

References

Other 2

  • TI-2026-20622 Group-Office is vulnerable to RCE due to Command Injection via TNEF Attachment Handler CVSS 4.0CRITICAL 9.4
  • TI-2026-20621 Group-Office is vulnerable to SSRF and File Read in WOPI service discovery CVSS 4.0HIGH 8.2
  • TI-2023-25213 Server-Side Request Forgery in groupoffice CVSS 3.1HIGH 8.8
  • TI-2025-30692 GroupOffice's Blind Stored XSS in Phone Number Field Enables Forced Redirect and Unauthorized Actions CVSS 4.0MEDIUM 6.9
  • TI-2025-18860 Group-Office has a Stored XSS Vulnerability via user's name field 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
See all 23 →

Sources

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