CVE-2026-75004

MEDIUM 4.3

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-77
Vendor	roundcube
Product	webmail
Published	Aug 17, 2026
Last Updated	Aug 17, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

Roundcube / Webmail

1.6.0 < 1.6.18 1.7.0 < 1.7.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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