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CERT-FR Warns of Roundcube Webmail Flaws

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Multiple Roundcube Webmail vulnerabilities allow remote code execution, SSRF, CSRF and denial of service; patches available in 1.6.21 and 1.7.6.

Sourcecert.cyber.gouv.fr — open the original

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CERT-FR published an advisory describing multiple vulnerabilities affecting Roundcube Webmail versions 1.6.x prior to 1.6.21 and 1.7.x prior to 1.7.6. The flaws collectively allow an attacker to bypass security policies, cause a remote denial of service, execute arbitrary code, perform server-side request forgery (SSRF), and conduct cross-site request forgery (CSRF) attacks against users or administrators of affected Roundcube instances.

No evidence of in-the-wild exploitation is mentioned in the advisory. CERT-FR directs administrators to the Roundcube security bulletin dated 09 November 2026 for patch details and recommends upgrading to version 1.6.21 or 1.7.6 as applicable. Organizations running Roundcube webmail should prioritize patching given the range of impacts, including remote code execution, and monitor for anomalous webmail activity consistent with CSRF/SSRF abuse.

Related reporting

Source reporting: https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1489

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