CVE-2026-54433: 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 exe

highCVSS 7.2CVE-2026-54433

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).

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 7.2
Published: 2026-07-14
Last updated: 2026-07-17
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-54433

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-544330.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-54433	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

medium[NEW] [medium] Roundcube: Multiple vulnerabilitiescert-bund
unknownDSA-6391-1 roundcube - security updatedebian
unknownMultiple vulnerabilities in Roundcube (July 6, 2026)cert-fr-avis

Recent advisories for In Roundcube Webmail

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[UPDATE] [high] Roundcube Webmail: Multiple vulnerabilitiescert-bund · 2026-07-22
mediumCVE-2026-54432: Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2 allows Stored Cross-Site Scripting (XSS…nvd · 2026-07-14
mediumCVE-2026-62644: In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, the password plugin of the Roundcub…nvd · 2026-07-14
highCVE-2026-62643: In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, insufficient Cascading Style Sheets…nvd · 2026-07-14
mediumCVE-2026-62642: In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, an infinite loop was discovered in …nvd · 2026-07-14
mediumCVE-2026-62641: In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, the TNEF decoder was subject to den…nvd · 2026-07-14