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CVE-2026-29202 is an input validation flaw in cPanel & WHM / WP Squared affecting the plugin parameter of the create_user API call. Insufficient validation of attacker-controlled input allows an already authenticated user to supply a crafted plugin value that is interpreted in a way that results in arbitrary Perl code execution. Available reporting indicates exploitation is possible via the create_user functionality, including /xml-api/createacct or equivalent JSON API paths, and that the injected code executes in the security context of the authenticated account’s system user. In shared hosting environments, this creates a practical post-authentication code-execution primitive that can be used for file access, persistence, and chaining with local privilege-escalation issues such as the related symlink flaw discussed in the same advisory set.
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What an attacker gets, and what they’ve been doing with it.
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create_user or createacct API activity. Review logs for anomalous authenticated requests, unexpected Perl execution, unauthorized file changes, persistence artifacts, and signs of prior compromise. In shared hosting environments, additional isolation and least-privilege controls may reduce blast radius, but no complete mitigation is provided in the content aside from applying the vendor fix.Patch, then assume compromise.
/scripts/upcp --force, then verify the installed version. Restarting affected services such as cpsrvd after patching is also referenced in the supporting material.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.
29 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A cPanel/WHM vulnerability caused by insufficient input validation in the plugin parameter of the create_user API call, allowing arbitrary Perl code execution as the authenticated account's system user.
A high-severity Perl code injection vulnerability in cPanel & WHM that allows an authenticated user to execute arbitrary Perl code via the create_user API call.
A critical improper validation flaw in the cPanel & WHM create_user API that could allow authenticated attackers to execute arbitrary Perl code with the privileges of the affected account.
A Perl code injection vulnerability in the cPanel create_user API call that can lead to remote code execution and potential full server 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.