[UPDATE] [medium] Roundcube: Multiple vulnerabilities

CSIRTS triage

What

An attacker can exploit multiple vulnerabilities in Roundcube to manipulate files, bypass security measures, conduct a cross-site scripting attack, and disclose information.

Who is affected

Deployments of Roundcube are affected by these vulnerabilities.

Urgency

Remediation is necessary as these vulnerabilities can lead to significant security breaches, although exploitation is not currently reported.

Action

Update Roundcube to the latest version to address these vulnerabilities.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source

CERT-Bund (BSI) Security Advisories (DE · national-cert · site)

Severity

medium

Published

2026-07-22

Exploitation

Not in CISA KEV at last sync

Language

Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0789

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-2026-355370.47% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all scored CVEs.
• Low exploitation riskCVE-2026-355380.28% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 21% of all scored CVEs.
• Low exploitation riskCVE-2026-355390.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all scored CVEs.
• Low exploitation riskCVE-2026-355400.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 23% of all scored CVEs.
• Low exploitation riskCVE-2026-355410.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 16% of all scored CVEs.
• Low exploitation riskCVE-2026-355420.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all scored CVEs.
• Low exploitation riskCVE-2026-355430.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all scored CVEs.
• Low exploitation riskCVE-2026-355440.37% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all scored CVEs.
• Low exploitation riskCVE-2026-355450.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 25% of all scored CVEs.

Referenced CVEs

Same CVEs, other sources

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

• unknownMultiple vulnerabilities in Roundcube (March 19, 2026)cert-fr-avis

Recent advisories for Roundcube

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.

• medium[NEW] [medium] Roundcube: Multiple vulnerabilitiescert-bund · 2026-07-28
• high[UPDATE] [high] Roundcube Webmail: Multiple vulnerabilitiescert-bund · 2026-07-22
• unknownDSA-6391-1 roundcube - security updatedebian · 2026-07-19
• highCVE-2026-54433: In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, there is Stored Cross-Site Scriptin…nvd · 2026-07-14
• 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

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