Read the docs
TI-2026-75276 Aliases CVE-2026-110039GHSA-w7j2-h466-h8g2

Smush Multisite Plugin Lets Single-Site Admins Change Network-Wide Setting

Priority LOW 13CWE-863Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-863.

Summary

The Smush WordPress plugin before 4.3.4 does not restrict changes to a network-wide access setting to network administrators, so an administrator of a single site on a multisite network can change it for the entire network. The flaw is an incorrect authorization check (CWE-863). An attacker needs administrator access to one site, and the impact is limited to low integrity loss. 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 Smush WordPress plugin before 4.3.4 does not restrict changes to a network-wide access setting to network administrators, allowing an administrator of a single site on a multisite network to change it for the entire network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00205 10th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Smush (Unknown): 4.3.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
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
UnknownSmushbefore 4.3.44.3.4Patch availableCNA
  • Smush VendorUnknown Affected before 4.3.4 Fixed in 4.3.4 Patch available CNA

Remediation

Update Smush to version 4.3.4 or later.

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

  • Fix · CNA Smush (Unknown) Fixed in 4.3.4

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-110039
  2. 2026-10-16 Alias added: GHSA-w7j2-h466-h8g2

References

Exploit 1

Sources

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