WordPress Filter Gallery Authorization Bypass Deletion

The Filter Gallery plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 1.1.4. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to delete any arbitrary Filter Gallery records — including all associated filters, image mappings, settings, and details options — by supplying attacker-controlled gallery IDs. The nonce bypass requires omitting the nonce POST field entirely rather than submitting an invalid value, as a present-but-invalid nonce is correctly rejected.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

The Filter Gallery plugin for WordPress contains a critical authorization bypass vulnerability (CVE-2026-89413, CVSS 8.1) that allows authenticated users with subscriber-level permissions to delete arbitrary gallery records without proper verification. By manipulating gallery IDs, attackers can systematically destroy filters, image mappings, and configuration settings belonging to other users or administrators. This vulnerability affects all versions up to 1.1.4 and is particularly dangerous because it requires only basic authentication access—a common entry point in compromised or insider-threat scenarios. The missing nonce validation compounds the risk, enabling cross-site request forgery attacks to automate the destruction of critical gallery content.

Casky's 283 mapped security skills leverage Claude AI's extended reasoning to detect the attack patterns underlying this vulnerability across MITRE ATT&CK's Privilege Escalation (TA0004) and Credential Access (TA0006) tactics. Practitioners using Casky would identify suspicious indicators such as: unauthorized DELETE requests targeting Filter Gallery database tables with varying IDs from low-privilege accounts, missing or invalid CSRF tokens in gallery modification requests, and audit logs showing gallery deletions initiated by users lacking administrative roles. The platform's skills would correlate these patterns with CWE-862 (Missing Authorization) signatures, flagging improper capability enforcement and the absence of role-based access controls. Security teams would see detailed findings on insecure direct object references (IDOR) combined with broken access control, enabling rapid threat hunting and remediation before attackers scale attacks across multiple galleries.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-89413.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

identity access management · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

Investigate the attack patterns behind CVE-2026-89413

Casky has 283 skills that investigate the attack patterns behind CVE-2026-89413. Run one and get CVSS-scored findings in 3 minutes.

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