CVE-2026-75004

MEDIUM
4.3
CVSS Score
Published: August 17, 2026 at 12:53 PM UTC
Updated: September 8, 2026 at 06:59 PM UTC
1 product affected across 1 vendorWebmail

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

1.6.0 ≤ v < 1.6.181.7.0 ≤ v < 1.7.31.6.01.7.0
Affected range stops below 1.6.18, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.7.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMmitre
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-77

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