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Popup by Supsystic EUVDEUVD-2026-60795

| CVE-2026-73380 CRITICAL
Deserialization of Untrusted Data (CWE-502)
2026-08-18 Patchstack GHSA-66gj-6m2v-rp63
Deserialization PHP Popup By Supsystic
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, no user interaction (PR:N/UI:N/AV:N/AC:L); high C/I/A reflects potential full compromise via a deserialization POP chain, matching worst-case object-injection impact.

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 18, 2026 - 14:57 vuln.today
CVE Published
Aug 18, 2026 - 14:00 cve.org
CRITICAL 9.8

DescriptionCVE.org

Unauthenticated PHP Object Injection in Popup by Supsystic <= 1.13.0 versions.

AnalysisAI

Unauthenticated PHP Object Injection in the WordPress plugin Popup by Supsystic (versions 1.13.0 and earlier) lets remote attackers submit crafted serialized data that the plugin deserializes without validation. Reported by Patchstack and rated CVSS 9.8, the flaw is exploitable without authentication or user interaction; if a suitable POP gadget chain is present in the WordPress core, another plugin, or theme, it can escalate to arbitrary file operations, SQL injection, or remote code execution. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify site running Popup by Supsystic ≤1.13.0
Delivery
Craft serialized PHP object payload
Exploit
Send unauthenticated request to deserialization endpoint
Execution
Trigger gadget chain via magic methods
Persist
Achieve code execution or file/DB actions
Impact
Compromise WordPress site
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Vulnerability AssessmentAI

Exploitation Exploitation requires that a request reach the plugin code path that deserializes untrusted input in Popup by Supsystic <= 1.13.0; per the CVSS vector (AV:N/AC:L/PR:N/UI:N) no authentication and no user interaction are needed against a default installation exposing that endpoint. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals point to a genuine high priority: the CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N) describes network-reachable, low-complexity, unauthenticated exploitation with no user interaction, and the C:H/I:H/A:H impact reflects the potential for full compromise through a deserialization gadget chain. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A remote attacker who has not authenticated to the site sends a crafted request to a plugin endpoint that passes attacker-controlled input into unserialize(), instantiating a malicious object graph. If the target's WordPress stack contains a suitable POP gadget chain, the object's magic methods fire and lead to file writes, data theft, or code execution - all without credentials or user interaction. …
Remediation Upgrade Popup by Supsystic to the first release above 1.13.0 that addresses this issue; the Patchstack advisory (https://patchstack.com/database/wordpress/plugin/popup-by-supsystic/vulnerability/wordpress-popup-by-supsystic-plugin-1-13-0-php-object-injection-vulnerability) is the reference for the fixed version, which is not independently confirmed in the provided data - verify the exact patched version on the WordPress.org plugin page before deploying. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: immediately remove Popup by Supsystic from all WordPress installations and audit server access logs for suspicious activity. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-60795 vulnerability details – vuln.today
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