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CVE-2026-18855 is a critical arbitrary file deletion vulnerability in the Link Library plugin for WordPress affecting all versions up to and including 7.9.4. The flaw is caused by insufficient file path validation in the ll_delete_link_fields function, allowing attacker-controlled path data associated with a submitted link to reach file deletion logic without being properly restricted to an intended directory. Under the required conditions, an unauthenticated attacker can submit a malicious link and cause arbitrary files on the server to be deleted when that link is permanently removed by an administrator. Because deletion of security-critical application files can destabilize the site and create conditions for follow-on compromise, the issue can lead to remote code execution in addition to direct file loss.
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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.
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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.