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CVE-2026-65638 is an improper neutralization of special elements used in an OS command vulnerability in the MESSENGER service of ConfigServer Security & Firewall (CSF). Insufficient escaping of a request URL allows attacker-controlled data to reach shell command execution. CSF versions 14.00 through 16.29 are affected. The issue also affects versions of the WebPros-maintained fork containing the vulnerable code; independently maintained forks require separate assessment.
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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.
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.
18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An unauthenticated remote arbitrary-command-execution vulnerability in the ConfigServer Security & Firewall (CSF) MESSENGER service. Exploitation requires MESSENGER to be enabled and a reCAPTCHA secret to be configured; successful commands execute as the unprivileged CSF service account.
An unauthenticated remote shell command-injection vulnerability in ConfigServer Security & Firewall (CSF), caused by improper escaping of a request URL. Successful exploitation allows arbitrary command execution under the CSF service account.
A vulnerability affecting ConfigServer Security & Firewall (CSF) versions 14.00 through 16.29.
A vulnerability affecting ConfigServer Security & Firewall (CSF) software versions 14.00 through 16.29.
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.