CVE-2026-35544

mediumpriority · track · 0EPSS 0.004 · 30 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.37% (30th) EPSS

CVSS 5.3 · medium

Is it mine?

15 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to a fixed-position mitigation bypass via the use of !important.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.3mediumAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondary · FSTEC (BDU) RU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondary · ENISA EU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondary · cve@mitre.org USexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondary · OSV

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-669USCWE-669USCWE-669US

affected products (15)

Products and version ranges known to be affected.

Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
SUSE openSUSEall versionscert_bundDEcpe:/o:suse:opensuse:-
Open Source Roundcube< 1.5.14cert_bundDE
Open Source Roundcube< 1.6.14cert_bundDE
Open Source Roundcube< 1.7-rc5cert_bundDE
Roundcube Webmail0 → 1.5.14enisa_euvdEU
Roundcube Webmail1.6.0 → 1.6.14enisa_euvdEU
The RoundCube Team RoundCube Webmail≤ 1.7-rc5fstec_bduRU
The RoundCube Team RoundCube Webmail≤ 1.6.14fstec_bduRU
The RoundCube Team RoundCube Webmail≤ 1.5.14fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 8.0fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 7.3fstec_bduRU
roundcube webmail≤ 1.5.13nvdUScpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*
roundcube webmail1.6.0 → 1.6.13nvdUScpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*
Packagist roundcube/roundcubemail1.7-beta → 1.7-rc5osvUSpkg:composer/roundcube/roundcubemail

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-0789Roundcube: Mehrere SchwachstellenDeutsch2026-03-18csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Roundcube ausnutzen, um Dateien zu manipulieren, um Sicherheitsvorkehrungen zu umgehen, um einen Cross-Site Scripting Angriff durchzuführen, und um Informationen offenzulegen.
GHSA-xpqh-grpw-4xmgRoundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages2026-04-03ghsa · osvUS
An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to a fixed-position mitigation bypass via the use of !important.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd osv NVD CVE.org MITRE

published 2026-04-03modified 2026-07-24

references (22)

External citations — patches, advisories, analysis.

scry

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