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CVE-2026-44177 is a high-severity path traversal vulnerability in Kirby CMS versions 5.3.0 through 5.4.0. Lazy loading introduced in 5.3.0 resolved account directories using a supplied user ID without sufficient format validation and containment enforcement. Attacker-controlled user IDs could escape the intended accounts directory during user lookup. The flaw affects the unauthenticated authentication API, authenticated users API, and other application code that passes request-controlled email addresses or IDs to the user lookup function. Traversal can cause inclusion of PHP entry-point files in reachable directories and can be used to test whether arbitrary directories exist.
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What an attacker gets, and what they’ve been doing with it.
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No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Unknown
A path traversal vulnerability in Kirby CMS that can lead to arbitrary PHP file inclusion of index.php files and directory probing/fingerprinting due to improper validation of user IDs.
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.