What’s Vulnerable › Vulnerabilities

CVE-2018-9846

• Severity: high (CVSS 8.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-04-07 · updated 2026-06-17
• Weakness: CWE-20

Description

In Roundcube from versions 1.2.0 to 1.3.5, with the archive plugin enabled and configured, it's possible to exploit the unsanitized, user-controlled "_uid" parameter (in an archive.php _task=mail&_mbox=INBOX&_action=plugin.move2archive request) to perform an MX (IMAP) injection attack by placing an IMAP command after a %0d%0a sequence. NOTE: this is less easily exploitable in 1.3.4 and later because of a Same Origin Policy protection mechanism.

Affected products

• Debian Linux: 9.0
• Roundcube Webmail: from 1.2.0 through 1.3.5

References

• https://github.com/roundcube/roundcubemail/issues/6229
• https://github.com/roundcube/roundcubemail/issues/6238
• https://medium.com/%40ndrbasi/cve-2018-9846-roundcube-303097048b0a
• https://www.debian.org/security/2018/dsa-4181
• https://github.com/roundcube/roundcubemail/issues/6229
• https://github.com/roundcube/roundcubemail/issues/6238
• https://medium.com/%40ndrbasi/cve-2018-9846-roundcube-303097048b0a
• https://www.debian.org/security/2018/dsa-4181

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