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CVE-2026-74997 is an OS command injection vulnerability in the optional markasjunk plugin for Roundcube Webmail. The cmd_learn driver unsafely incorporates crafted placeholder replacement values into command execution, allowing an attacker to introduce and execute arbitrary code. It affects Roundcube Webmail 1.6.0 through versions before 1.6.18 and 1.7.0 through versions before 1.7.3, but only where markasjunk is enabled and configured to use the cmd_learn driver.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in Roundcube Webmail covered by the 1.6.18 detection plugin.
A vulnerability tracked as CVE-2026-74997 and associated in this reference with the Roundcube Debian source package.
A high-severity remote code execution flaw in Roundcube's markasjunk plugin via crafted placeholder values in the cmd_learn driver, allowing arbitrary code injection and execution when that plugin/driver combination is enabled.
A remote code execution vulnerability in the cmd_learn driver of Roundcube Webmail's markasjunk plugin, affecting certain versions when that driver is in use.
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.