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Ninja Tables Pro CVE-2026-73533

| EUVDEUVD-2026-58112 CRITICAL
Embedded Malicious Code (CWE-506)
2026-08-13 disclosure@vulncheck.com GHSA-7wc4-82pm-hqcg
PHP Information Disclosure
9.3
CVSS 4.0 · Vendor: vulncheck
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Severity by source

Vendor (vulncheck) PRIMARY
9.3 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
9.8 CRITICAL

Embedded backdoor exposes an unauthenticated network-reachable REST endpoint and passwordless admin, giving full C/I/A impact with no privileges or interaction once the tampered build is installed.

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 (vulncheck).

CVSS VectorVendor: vulncheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 13, 2026 - 16:36 vuln.today
CVE Published
Aug 13, 2026 - 16:19 cve.org
CRITICAL 9.3

DescriptionCVE.org

Ninja Tables Pro 5.2.11 contains an embedded malicious code vulnerability introduced via a tampered plugin build served through a decommissioned update server. The tampered build introduced a rogue PHP file (app/Library/updater/NinjaTableDataSync.php) that established a backdoor REST API endpoint, dropped persistent PHP files in mu-plugins and uploads directories, installed a passwordless administrator account, and registered scheduled tasks that survived plugin removal.

Articles & Coverage 1

News Critical Supply Chain Backdoor in Ninja Tables Pro WordPress Plugin - CVE-2026-73533 Aug 14, 2026

AnalysisAI

Supply-chain compromise of the Ninja Tables Pro WordPress plugin (version 5.2.11) delivered a tampered build through a decommissioned vendor update server, embedding a backdoor that gives attackers full control of affected WordPress sites. Once installed, the rogue code stands up an unauthenticated REST API endpoint, plants a passwordless administrator account, and drops persistent PHP payloads that survive plugin removal. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Tampered plugin build served via rogue update server
Delivery
Admin installs Ninja Tables Pro 5.2.11
Exploit
Backdoor plants mu-plugins, uploads payloads, admin account
Execution
Attacker calls unauthenticated REST endpoint
Persist
Execute PHP as web server, exfiltrate database
Impact
Persist via cron surviving plugin removal
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the victim installed the specific tampered Ninja Tables Pro 5.2.11 build delivered from the decommissioned vendor update server during the compromise window - the legitimate build is not affected, so this is the primary limiting factor. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a high-priority, real-world risk rather than a theoretical high-CVSS issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A site administrator updated or installed Ninja Tables Pro 5.2.11 while the vendor's now-decommissioned update server was serving the tampered build, silently installing the backdoor. An attacker then sends an unauthenticated request to the rogue REST API endpoint (or logs in via the planted passwordless admin account) to execute PHP, exfiltrate the database, and maintain persistence through mu-plugins and cron even after the plugin is removed. …
Remediation Treat any site that installed the tampered Ninja Tables Pro 5.2.11 as fully compromised and perform incident response rather than a simple update - patching the plugin alone is insufficient because the backdoor persists outside the plugin directory. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Audit WordPress inventory to identify all instances running Ninja Tables Pro version 5.2.11, and review access logs and admin account listings for suspicious activity indicative of backdoor activation. …

Sign in for detailed remediation steps and compensating controls.

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CVE-2026-73533 vulnerability details – vuln.today
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