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CVE-2025-35939 is an external control of assumed-immutable web parameter vulnerability in Craft CMS. When redirecting an unauthenticated request that requires authentication to the login page, Craft CMS creates a server-side PHP session file and stores the client-supplied return URL without sanitizing its parameters. An unauthenticated attacker can therefore write arbitrary content, including potential PHP code, to a predictable session-file location. Execution of injected content requires combination with a separate vulnerability that can access or execute the session file.
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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.
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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Unknown (the content only references the CVE identifier without describing the vulnerability, affected product, impact, or exploitation details).
A web parameter manipulation vulnerability in Craft CMS that may allow unauthenticated manipulation leading to file modification or database compromise.
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.