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Fencer Intel
medium 4.3

CVE-2026-25916 json

Roundcube Webmail before 1.5.13 and 1.6 before 1.6.13, when "Block remote images" is used, does not block SVG feImage.

published 9mo ago modified 4mo ago also EUVD-2026-6937

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

Roundcube Webmail before 1.5.13 and 1.6 before 1.6.13, when "Block remote images" is used, does not block SVG feImage.

Patch / fix

  • Roundcube Webmail 1.5.13, 1.6.13
  • roundcube Debian 12 1.6.5+dfsg-1+deb12u7
  • roundcube Debian 13 1.6.13+dfsg-0+deb13u1
  • roundcube Debian 14 1.6.13+dfsg-1

debian advisories DEBIAN-CVE-2026-25916

  • roundcube Ubuntu Pro 18.04 LTS 1.3.6+dfsg.1-1ubuntu0.1~esm8
  • roundcube Ubuntu Pro 20.04 LTS 1.4.3+dfsg.1-1ubuntu0.1~esm8
  • roundcube Ubuntu Pro 22.04 LTS 1.5.0+dfsg.1-2ubuntu0.1~esm6
  • roundcube Ubuntu Pro 24.04 LTS 1.6.6+dfsg-2ubuntu0.1+esm3

ubuntu advisories UBUNTU-CVE-2026-25916

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • roundcubemail openSUSE Leap 16.0 1.6.13-bp160.1.1

opensuse advisories openSUSE-SU-2026:20323-1

Is CVE-2026-25916 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-25916 updated cvss 4.3

roundcubemail: SVG feImage bypasses image blocking to track email opens

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
9mo ago

Exploit prediction

0.76% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

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

Affected products

  • Roundcube Webmail

Classification

Weakness
  • CWE-420 Unprotected Alternate Channel

References

Sources

Fencer Intel 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.