CVE-2026-35540

mediumpriority · track · 26EPSS 0.004 · 31 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.39% (31st) EPSS

CVSS 6.5 · medium

Is it mine?

12 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-21

An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts.

cvss

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

6.5

010

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

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 2.5

v3.16.5mediumAV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Nsecondary · FSTEC (BDU) RU

v3.15.4mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:Nsecondary · ENISA EU

v3.15.4mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:Nsecondary · cve@mitre.org USexploitability 2.2 · impact 2.7

v3.15.4mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:Nsecondary · OSV

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

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

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-669USCWE-669USCWE-669USCWE-918US

affected products (12)

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 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
ООО «Ред Софт» РЕД ОС≤ 8.0fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 7.3fstec_bduRU
roundcube webmail1.6.0 → 1.6.14nvdUScpe: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-vxg2-hhgr-37fxRoundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages2026-04-03ghsa · osvUS
An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts.

also known as (3)

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 (16)

External citations — patches, advisories, analysis.

scry

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