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CVE-2026-13756 is a privilege escalation vulnerability in the WP Grid Builder plugin for WordPress affecting all versions up to and including 2.3.3. The flaw is caused by missing authorization checks and insufficient meta key validation in the update() handler exposed through the /wp-json/wpgb/v2/metadata REST endpoint. An authenticated user can submit a crafted nested array payload that updates their own user metadata, including wp_capabilities, allowing unauthorized modification of role and capability assignments. By abusing this logic flaw, a low-privileged user can promote their account to Administrator.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.