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CVE-2024-42009

Critical CVSS 9.3 Known exploited

Published 2024-08-05 · last changed 2026-06-17 · added to CISA KEV 2025-06-09

This one is being exploited in the wild.

CISA added CVE-2024-42009 to the Known Exploited Vulnerabilities catalog on 2025-06-09. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2024-42009, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

A Cross-Site Scripting vulnerability in Roundcube through 1.5.7 and 1.6.x through 1.6.7 allows a remote attacker to steal and send emails of a victim via a crafted e-mail message that abuses a Desanitization issue in message_body() in program/actions/mail/show.php.

Sources

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N