VulnerabilityModified

CVE-2018-9846

HIGH 8.8EPSS 2.28%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (2.28%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.0: 8.8 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS: 2.28% probability · 83th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-20
Affected: roundcube/webmail · debian/debian linux
Source: cve@mitre.org

EPSS trend

EPSS 2.3% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.