CVE-2026-54433

criticalpriority · attend · 50EPSS 0.003 · 24 %ileexploit · PoCDEEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

0.31% (24th) EPSS

CVSS 10 · critical

Is it mine?

13 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-26

In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, there is Stored Cross-Site Scripting (XSS) via a crafted plain-text email message. The attacker-controlled JavaScript executes within the victim's authenticated session simply by opening or previewing the message (zero-click).

cvss

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

10.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.2–10

v3.110criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 5.8

v3.17.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:Nsecondary · ENISA EU

v3.17.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:Nsecondary · cve@mitre.org USexploitability 3.9 · impact 2.7

v3.19.4criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N/E:Psecondary · 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-79US

exploits (1)

Public proof-of-concept and weaponised exploit code.

aramosf/CVE-2026-54433CVE-2026-54433 Roundcube plain-text email stored XSS PoCPoC · poc_in_github

affected products (13)

Products and version ranges known to be affected.

Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
Open Source Roundcube< 1.6.17cert_bundDE
Open Source Roundcube< 1.7.2cert_bundDE
cPanel cPanel/WHM< 110.0.136cert_bundDE
cPanel cPanel/WHM< 110.0.138cert_bundDE
cPanel cPanel/WHM< 134.0.45cert_bundDE
cPanel cPanel/WHM< 136.0.29cert_bundDE
cPanel cPanel/WHM< 137.9999.96cert_bundDE
Roundcube Webmail1.6.0 → 1.6.17enisa_euvdEU
Roundcube Webmail1.7.0 → 1.7.2enisa_euvdEU
roundcube webmail< 1.6.17nvdUScpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*
roundcube webmail1.7.0 → 1.7.2nvdUScpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-2207Roundcube: Mehrere SchwachstellenDeutsch2026-07-05csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Roundcube ausnutzen, um Sicherheitsvorkehrungen zu umgehen, Denial-of-Service-Angriffe zu verursachen, Cross-Site-Scripting-Angriffe durchzuführen sowie Daten zu manipulieren oder offenzulegen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd NVD CVE.org MITRE

published 2026-07-14modified 2026-10-24

references (3)

External citations — patches, advisories, analysis.

scry

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