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CVE-2024-58136 affects Yii 2 before 2.0.52 and is described as an improper protection of alternate path / input validation flaw that mishandles attachment of behaviors defined via an __class array key. The issue is a regression of CVE-2024-4990. In observed exploitation against applications using Yii, notably Craft CMS, attackers used the flaw in a second-stage payload: after a separate bug caused attacker-controlled PHP content to be written into a session file, a malicious JSON payload leveraging Yii's behavior attachment and object instantiation logic triggered execution of PHP code from that session file. The vulnerability was reported as exploited in the wild from February through April 2025 and was fixed in Yii 2.0.52 on 2025-04-09.
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__class and anomalous POST activity associated with the observed Craft CMS chain. Restrict write/execute paths for web-accessible PHP files where possible, harden session storage handling, and use WAF or reverse-proxy rules to block known exploit patterns. If compromise is suspected, refresh application security keys and rotate database and other sensitive credentials.Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
28 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An input validation flaw in the Yii framework used by Craft CMS that was chained with CVE-2025-32432 in attacks in the wild to breach servers.
A Yii framework input validation flaw that was reportedly chained with CVE-2025-32432 in real-world attacks to facilitate compromise and persistence.
A critical Craft CMS exploitation chain component: an alternate path protection flaw in the Yii PHP framework used in zero-day attacks against Craft CMS servers.
An improper protection of alternate path vulnerability in the Yii framework leading to arbitrary code execution, exploited in zero-day attacks against Craft CMS.
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.