VulnerabilityAnalyzed

CVE-2026-75004

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, improper rule name quoting could lead to managesieve_disabled_actions setting bypass via a crafted rule name in a Sieve script.

MEDIUM 4.3EPSS 0.27%

Does this matter?

Lower severity and a low EPSS score (0.27%). Track it; it rarely justifies an emergency change on its own.

Description

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, improper rule name quoting could lead to managesieve_disabled_actions setting bypass via a crafted rule name in a Sieve script. This issue only affects Roundcube instances using the managesieve plugin.

CVSS 3.1: 4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
EPSS: 0.27% probability · 20th percentile
CISA KEV: Not listed
Weakness: CWE-77
Affected: roundcube/webmail
Source: cve@mitre.org

References

https://github.com/roundcube/roundcubemail/releases/tag/1.6.18Release Notes
https://github.com/roundcube/roundcubemail/releases/tag/1.7.3Release Notes
https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.