CVE-2018-9846

Name: CVE-2018-9846
Creator: NVD / NIST
Published: 2018-04-07T21:29:00.413+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.29%

Last modified Jun 17, 2026

CVE-2018-9846 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 2.29% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

2.29%

81.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Roundcube	Webmail	>= 1.2.0, <= 1.3.5
Debian	Debian Linux	9.0

References

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

Timeline

Published: Apr 7, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-9846?

How severe is CVE-2018-9846?

Severity scoring for CVE-2018-9846 is pending analysis. The EPSS model estimates a 2.29% probability of exploitation in the next 30 days.

How do I fix CVE-2018-9846?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-9846?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST