EUVD-2026-66873
GHSA-fwv9-6885-g85c
Severity by source
AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
S:C chosen because exploitation escapes one site's security boundary to affect the entire multisite network; all other metrics align with the official vector.
Primary rating from Vendor (wpscan).
CVSS VectorVendor: wpscan
Lifecycle Timeline
4DescriptionCVE.org
The Smush WordPress plugin before 4.3.2 does not restrict a network-wide setting to network administrators, allowing an administrator of any single site on a multisite network to execute arbitrary code across the entire network.
AnalysisAI
Privilege escalation to network-wide remote code execution in the Smush WordPress plugin (versions 3.22.1 through 4.3.2) allows any authenticated single-site administrator on a WordPress multisite network to execute arbitrary code across all sites in that network. The flaw arises because the plugin's network-wide configuration interface fails to restrict access to network administrators only, permitting lower-privileged site admins to reach settings with cross-network impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires three concurrent conditions: (1) the target environment must be a WordPress multisite network - standalone single-site installations are not affected; (2) the Smush plugin must be network-activated on that multisite instance; (3) the attacker must hold administrator-level credentials for at least one site within the network (CVSS PR:H), not necessarily full network administrator credentials. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 7.2 (High) reflects full C/I/A impact at H with a network attack vector, but PR:H materially constrains real-world risk - exploitation requires a compromised or controlled site-level administrator account. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Smush to version 4.3.2 or later, the vendor-released patch confirmed by EUVD-2026-66873 and the WPScan advisory (https://wpscan.com/vulnerability/77187a44-9850-4b7e-a6c2-84de660f46a3/). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory WordPress multisite installations running Smush versions 3.22.1 through 4.3.2 and document all site administrators with access. …
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External POC / Exploit Code
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