Multiple vulnerabilities in Roundcube (March 19, 2026)

unknownCVE-2026-35537 CVE-2026-35545 CVE-2026-35544

Multiple vulnerabilities have been discovered in Roundcube. Some of them allow an attacker to cause a breach of data confidentiality, server-side request forgery (SSRF), and indirect remote code injection (XSS).

CSIRTS triage

vendor: Roundcube product: Roundcube Information disclosure Server-side request forgery Cross-site scriptingOther

What: Multiple vulnerabilities allow an attacker to breach data confidentiality, perform server-side request forgery, and execute indirect remote code injection.
Who is affected: Deployments of Roundcube are affected by these vulnerabilities.
Urgency: Remediation is urgent due to the potential for data breaches and exploitation of the vulnerabilities, although exploitation status is currently unknown.
Action: Users should apply available patches or updates to mitigate these vulnerabilities.

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

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Details

Source: CERT-FR Avis de sécurité (FR · national-cert · site)
Severity: unknown
Published: 2026-03-19
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0320/

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-2026-355450.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 25% 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.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-35537	coverage & exploitation status	NVD · CVE.org
CVE-2026-35545	coverage & exploitation status	NVD · CVE.org
CVE-2026-35544	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

medium[UPDATE] [medium] Roundcube: Multiple vulnerabilitiescert-bund

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
medium[UPDATE] [medium] Roundcube: 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