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CVE-2026-74998 is a CSS proxy response-validation flaw in Roundcube Webmail before 1.6.18 and in the 1.7 branch before 1.7.3. The CSS proxy did not validate proxied responses, permitting MIME-sniffing conditions that may expose sensitive information or enable cross-site scripting.
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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.
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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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specifically referenced vulnerability in Roundcube Webmail.
A vulnerability tracked as CVE-2026-74998 and associated in this reference with the Roundcube Debian source package.
A high-severity Roundcube flaw where CSS proxy responses were not validated, enabling sensitive information disclosure or cross-site scripting via MIME sniffing.
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.