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Kalles Addons EUVDEUVD-2026-62390

| CVE-2026-73389 CRITICAL
Deserialization of Untrusted Data (CWE-502)
2026-08-19 Patchstack GHSA-m7jf-qrf9-6rj3
Deserialization PHP Kalles Addons
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 remote deserialization with no user interaction (AV:N/AC:L/PR:N/UI:N); a reachable gadget chain yields full C/I/A impact, matching the reported 9.8.

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

2
Analysis Generated
Aug 19, 2026 - 13:21 vuln.today
CVE Published
Aug 19, 2026 - 12:38 cve.org
CRITICAL 9.8

DescriptionCVE.org

Unauthenticated PHP Object Injection in Kalles Addons <= 1.0.6 versions.

Articles & Coverage 1

News Critical PHP Object Injection in WordPress Kalles Addons Plugin - CVE-2026-73389 Aug 20, 2026

AnalysisAI

Unauthenticated PHP Object Injection in the WordPress 'Kalles Addons' plugin (by the4) through version 1.0.6 lets remote attackers inject arbitrary serialized PHP objects, potentially escalating to code execution, data theft, or site takeover if a suitable gadget chain is present. The CVSS 9.8 (AV:N/AC:L/PR:N/UI:N) reflects network-reachable, no-authentication, low-complexity exploitation with full confidentiality, integrity, and availability impact. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify site running Kalles Addons ≤1.0.6
Delivery
Craft serialized PHP object payload
Exploit
Send to unauthenticated endpoint
Execution
Object injected via unserialize()
Persist
Trigger gadget chain magic methods
Impact
Achieve RCE or data compromise
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Vulnerability AssessmentAI

Exploitation Exploitation requires that untrusted serialized input reach the plugin's deserialization sink; per the CVSS vector (AV:N/AC:L/PR:N/UI:N) this is remote, unauthenticated, and needs no user interaction against affected Kalles Addons installations up to 1.0.6. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals are largely aligned toward high priority but with one important caveat. … 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 vulnerable Kalles Addons endpoint containing a serialized PHP object payload, requiring no authentication and no user interaction. If a compatible gadget chain is present in the site's loaded PHP classes, the injected object triggers unintended method calls during deserialization, leading to file operations, SQL manipulation, or remote code execution. …
Remediation Upgrade Kalles Addons to a version later than 1.0.6 once the vendor (the4) releases a patched build; the input data does not specify an exact fixed version, so no vendor-released patch version is independently confirmed - verify the latest release via the Patchstack advisory (https://patchstack.com/database/wordpress/plugin/kalles-addons/vulnerability/wordpress-kalles-addons-plugin-1-0-6-php-object-injection-vulnerability?_s_id=cve) and the WordPress plugin repository before deploying. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: audit all WordPress installations for Kalles Addons plugin through version 1.0.6 and immediately disable or remove the affected plugin to eliminate the attack vector; implement Web Application Firewall rules blocking PHP object injection patterns. …

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EUVD-2026-62390 vulnerability details – vuln.today
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