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TI-2026-73846 Aliases CVE-2026-107508GHSA-xwr4-4p99-jhp5

Unauthenticated file inclusion in Ultimate Multisite WordPress plugin

Priority MEDIUM 44CWE-22Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-22 and the CVSS impact.

Summary

The Ultimate Multisite WordPress plugin before 2.17.2 does not validate a user-supplied value used to select a file to include. This path traversal flaw (CWE-22) lets an unauthenticated remote attacker include and read arbitrary local files, including the WordPress configuration file. A public exploit is linked in the references.

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

Description from the CNA

The Ultimate Multisite WordPress plugin before 2.17.2 does not validate a user-supplied value used to select a file to include, allowing unauthenticated attackers to include and read arbitrary local files, including the WordPress configuration file.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00503 43rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Ultimate Multisite (Unknown): 2.17.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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
UnknownUltimate Multisitebefore 2.17.22.17.2Patch availableCNA
  • Ultimate Multisite VendorUnknown Affected before 2.17.2 Fixed in 2.17.2 Patch available CNA

Remediation

Update Ultimate Multisite to version 2.17.2, which fixes the issue.

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

  • Fix · CNA Ultimate Multisite (Unknown) Fixed in 2.17.2

Timeline

  1. 2026-10-14 Threatist record created from CVE-2026-107508
  2. 2026-10-14 Alias added: GHSA-xwr4-4p99-jhp5
  3. 2026-10-14 CVSS score added · CISA ADP
  4. 2026-10-14 Weakness changed · CISA ADP
  5. 2026-10-14 CISA SSVC decision points changed
  6. 2026-10-14 Priority changed: LOW → MEDIUM

References

Exploit 1

Sources

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