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VulnerabilityPublished

CVE-2026-75004: Roundcube Webmail · Command Injection

Affects Roundcube WebmailSource CVE Database V5

0

Not known to be exploited · CVSS 4.3 Medium : upgrade to 1.7.3 or 1.6.18 when convenient.

Data as of 26 Oct 2026, 09:26 UTC

CVSS 3.1 base score
4.3Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 31% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-08-17.

Patch
Available – fixed in 1.7.3, 1.6.18
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 17 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade Roundcube Webmail to 1.7.3 or 1.6.18.

Affected software

ProductAffectedFixed in
RoundcubeWebmailAffected
  • >=1.6.0 <1.6.18
  • >=1.7.0 <1.7.3
Fixed in
  • 1.7.3
  • 1.6.18

AI-suggested

Users should upgrade Roundcube Webmail to version 1.6.18 or later, or 1.7.3 or later, where this vulnerability is fixed. No other mitigation or workaround is indicated.

Description

CVE-2026-75004 is a command injection vulnerability in Roundcube Webmail versions before 1.6.18 and 1.7.x before 1.7.3. It arises from improper quoting of rule names in the managesieve plugin, allowing bypass of the managesieve_disabled_actions setting via crafted Sieve script rule names. This issue affects only Roundcube instances using the managesieve plugin.

References

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