EUVD-2026-75267
GHSA-3237-mv84-xmm9
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
AC:H reflects dual exploitation prerequisites - an absent or weak WordPress nonce key and a usable POP gadget chain in co-installed code - neither of which can be assumed present at any arbitrary target.
Primary rating from Vendor (WPScan).
CVSS VectorVendor: WPScan
Lifecycle Timeline
5DescriptionCVE.org
The Site Reviews WordPress plugin before 8.3.0 does not prevent request data from being deserialized, and derives the key protecting that data by padding out the site's WordPress nonce key, which makes the key publicly computable on installs where that key is absent, left at its sample value, or too short to be secret. This allows unauthenticated users to inject arbitrary PHP objects on such installs. The Site Reviews WordPress plugin before 8.3.0's own code contains no chain onward from the injected object, so how far it reaches depends on the other code present on the site.
AnalysisAI
PHP object injection in the Site Reviews WordPress plugin before 8.3.0 allows unauthenticated remote attackers to deserialize arbitrary PHP objects on installations where the WordPress nonce key is absent, set to its sample/placeholder value, or too short to be secret. The plugin derives its deserialization protection key by padding the site's nonce key, making that derived key trivially computable under these common misconfiguration conditions. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation simultaneously requires two conditions: (1) the target WordPress installation must have an absent, default/sample-placeholder, or insufficiently short nonce key in wp-config.php - specifically, any site where NONCE_KEY or AUTH_KEY was never replaced from the wp-config-sample.php default strings ('put your unique phrase here' or similar) or is shorter than ~20 characters of entropy is vulnerable to the key-computation step; sites that used the WordPress secret key generator to produce proper 64-character random values are not exploitable via this mechanism; (2) a PHP POP gadget chain usable for code execution must be present in code loaded by the site - typically from other installed plugins or themes; the Site Reviews plugin itself provides no exploitable chain, so sites with minimal plugin footprints face reduced impact. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.1 score with vector AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H correctly models two complicating factors in AC:H: the nonce-key misconfiguration prerequisite and the gadget-chain dependency. … 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 | Vendor-released patch: Site Reviews 8.3.0. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all WordPress instances running Site Reviews and verify the installed version is 8.3.0 or later; audit WordPress configuration files to ensure AUTH_KEY, SECURE_AUTH_KEY, LOGGED_IN_KEY, and NONCE_KEY are set to strong random values, not defaults or placeholder strings. …
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Same weakness CWE-502 – Deserialization of Untrusted Data
View allSame technique Deserialization
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External POC / Exploit Code
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