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Fencer Vulns
medium 4.3

CVE-2026-75004 json

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 by…

published 2026-08-17 2 mo ago modified 2026-09-08 2 mo ago also EUVD-2026-60170

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 19%
public exploits
0
none known

Summary

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.

Patch / fix

  • Roundcube Webmail 1.6.18, 1.7.3
  • roundcube Debian 12 1.6.5+dfsg-1+deb12u11
  • roundcube Debian 13 1.6.18+dfsg-0+deb13u1
  • roundcube Debian 14 1.6.18+dfsg-1

debian advisories DEBIAN-CVE-2026-75004

  • roundcubemail openSUSE Leap 16.0 1.6.20-bp160.1.1
  • roundcubemail openSUSE Tumbleweed 1.6.19-1.1

opensuse advisories openSUSE-SU-2026:22195-1openSUSE-SU-2026:12169-1

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Affected products

  • Roundcube Webmail

Classification

Weakness
  • CWE-77 Improper Neutralization of Special Elements used in a Command

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.