EUVD-2026-53983
GHSA-f7mx-xq66-8fmx
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network-reachable deserialization (AV:N/PR:N/UI:N/AC:L); worst-case POP chain yields full C/I/A compromise, matching the reported vector.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Unauthenticated PHP Object Injection in WPBruiser {no- Captcha anti-Spam} <= 3.1.43 versions.
Articles & Coverage 1
AnalysisAI
PHP Object Injection in the WPBruiser {no- Captcha anti-Spam} WordPress plugin (versions ≤ 3.1.43) allows remote unauthenticated attackers to inject crafted serialized objects that are deserialized by the plugin, enabling arbitrary object instantiation and, when combined with a suitable POP gadget chain, code execution or data compromise. The flaw carries a CVSS 9.8 (AV:N/AC:L/PR:N/UI:N) and is reported by Patchstack (EUVD-2026-53983). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target site is running WPBruiser {no- Captcha anti-Spam} version 3.1.43 or earlier and that the attacker can reach a plugin input path that passes attacker-controlled data into PHP deserialization - consistent with the unauthenticated network vector (AV:N/PR:N/UI:N), no login or user interaction is needed against a default install. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H = 9.8) indicates a network-reachable, low-complexity, unauthenticated attack with high impact across confidentiality, integrity, and availability - a strong prioritization signal for an internet-facing WordPress site. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker sends a crafted HTTP request to a public WordPress page or AJAX endpoint handled by WPBruiser, embedding a serialized PHP object string in an input the plugin unserializes. When the plugin deserializes the payload, a POP gadget chain from WordPress core or another installed plugin fires via a magic method, letting the attacker write files, manipulate the database, or execute code - all without authentication. … |
| Remediation | Upgrade to a fixed release above 3.1.43 as soon as the vendor publishes one; the input data does not include a confirmed fixed version, so consult the Patchstack advisory (https://patchstack.com/database/wordpress/plugin/goodbye-captcha/vulnerability/wordpress-wpbruiser-no-captcha-anti-spam-plugin-3-1-43-php-object-injection-vulnerability) for the patched version before deploying. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all WordPress installations to identify which are running WPBruiser version 3.1.43 or earlier and assess their criticality and internet exposure. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
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External POC / Exploit Code
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