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Booktics EUVDEUVD-2026-41364

| CVE-2026-57621 CRITICAL
Deserialization of Untrusted Data (CWE-502)
2026-07-02 Patchstack GHSA-p7cq-jc3q-mqj2
Deserialization PHP Booktics
9.8
CVSS 3.1 · Vendor: Patchstack
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Severity by source

Vendor (Patchstack) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
9.8 CRITICAL

Unauthenticated network-reachable deserialization justifies AV:N/AC:L/PR:N/UI:N; high C/I/A reflects potential RCE, though this assumes a reachable POP gadget chain.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

1
Analysis Generated
Jul 02, 2026 - 12:01 vuln.today

DescriptionCVE.org

Unauthenticated PHP Object Injection in Booktics <= 1.0.21 versions.

Articles & Coverage 1

News Critical PHP Object Injection in Booktics WordPress Plugin - CVE-2026-57621 Jul 03, 2026

AnalysisAI

Unauthenticated PHP Object Injection in the Booktics WordPress plugin (by Arraytics) affects all versions up to and including 1.0.21, letting remote attackers with no authentication inject arbitrary PHP objects into the application. If a suitable POP (property-oriented programming) gadget chain exists in the plugin, WordPress core, or another active plugin, this can escalate to remote code execution, data theft, or full site takeover. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify site running Booktics <= 1.0.21
Delivery
Send crafted serialized PHP object to plugin endpoint
Exploit
Trigger unserialize() object injection
Execution
Invoke magic-method gadget chain
Persist
Execute code or write files
Impact
Compromise WordPress site
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Vulnerability AssessmentAI

Exploitation Exploitation requires the Booktics plugin (version <= 1.0.21) to be installed and active on a network-reachable WordPress site, with an attacker-reachable code path that passes untrusted input into PHP's unserialize(). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) describes a network-reachable, low-complexity, unauthenticated flaw with full confidentiality, integrity, and availability impact - a top-priority profile on paper. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated attacker sends a crafted HTTP request to a Booktics endpoint containing a serialized PHP object string in a parameter that the plugin passes to unserialize(). When deserialized, the injected object triggers magic methods that, combined with an available gadget chain in WordPress or an active plugin, lead to arbitrary file operations or code execution. …
Remediation No vendor-released patch version is identified in the available data; the advisory only confirms that versions through 1.0.21 are vulnerable, so upgrade to the latest Booktics release above 1.0.21 once the vendor publishes a fix and verify the changelog addresses this issue (reference: the Patchstack advisory at https://patchstack.com/database/wordpress/plugin/booktics/vulnerability/wordpress-booktics-plugin-1-0-21-php-object-injection-vulnerability). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

24 hours: Disable and deactivate the Booktics plugin across all WordPress installations via admin panel or file removal; inventory affected sites. …

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EUVD-2026-41364 vulnerability details – vuln.today
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