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Roundcube Webmail released security updates 1.6.18 and 1.7.3 to fix vulnerabilities affecting earlier versions of the platform. Public advisories from Roundcube, the Canadian Centre for Cyber Security, and Paraguay's CERT warned that deployments running versions prior to 1.6.18 in the 1.6.x branch and prior to 1.7.3 in the 1.7.x branch are exposed and should be updated.
The Canadian advisory AV26-793 said the issues affect Roundcube Webmail as of August 9 and urged administrators and users to review vendor guidance and apply the released patches. The coordinated notices indicate broad government and vendor attention to the flaws, with the vendor update serving as the primary remediation path for organizations using Roundcube in production.
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The Canadian Centre for Cyber Security published advisory AV26-793 warning that Roundcube Webmail was affected by vulnerabilities and urging administrators and users to apply the available updates. The advisory referenced the newly released Roundcube security updates.
Roundcube released security updates 1.6.18 and 1.7.3 to address vulnerabilities in Roundcube Webmail. Versions prior to 1.6.18 and prior to 1.7.3 were identified as affected.
CERT-PY published a notice about vulnerabilities affecting Roundcube products. The reference indicates the notice was published on July 17, 2026.
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Roundcube Webmail released urgent security updates to fix multiple high-risk vulnerabilities across supported branches, including versions **1.6.16** and **1.7.1**, following earlier fixes in **1.6.14** for the 1.6.x line. The newly disclosed issues include **CVE-2026-48842**, a pre-authentication SQL injection flaw in the `virtuser_query` plugin with a CVSS score of **8.1**, and **CVE-2026-48844**, a code injection bug tied to direct code evaluation in LDAP autovalues configuration that could enable arbitrary command execution. Additional patches address XSS, session poisoning, arbitrary file deletion, and SSRF bypass vulnerabilities tracked as **CVE-2026-48845** through **CVE-2026-48849**, and a dCERT advisory also lists Roundcube as affected by multiple vulnerabilities. Earlier Roundcube fixes had already addressed a separate set of severe weaknesses, including a pre-authentication arbitrary file write issue in Redis and Memcached session handlers that could lead to unauthenticated remote code execution and full server compromise, along with account takeover, SSRF, IMAP injection, CSRF bypass, and HTML attachment preview XSS. Researchers credited across the disclosures include **y0us**, **Georgios Tsimpidas**, **flydragon777**, the **Martila Security Research Team**, **aikido_security**, and **nullcathedral**. Roundcube described the releases as stable and urged administrators to back up systems and deploy updates quickly to protect exposed email infrastructure from pre-authentication exploitation.
Jun 29, 2026
Roundcube released security updates for its webmail software to fix multiple vulnerabilities affecting versions prior to `1.6.14`, including a pre-authentication arbitrary file write tied to unsafe deserialization in the Redis/Memcache session handler and tracked externally as `CVE-2026-35537`. The updates in versions `1.5.14` and `1.6.14` also addressed a password change issue, an IMAP injection flaw with CSRF bypass, several remote image blocking bypasses, a fixed-position mitigation bypass, an XSS issue in HTML attachment preview, and an SSRF plus information disclosure weakness involving stylesheet links to local network hosts. Roundcube noted that `1.7` pre-release builds were also affected. A follow-up release in versions `1.5.15` and `1.6.15` corrected regressions introduced by the earlier fixes and patched an additional cross-site issue described as an SVG Animate FUNCIRI attribute bypass, which could allow remote image loading through `fill`, `filter`, and `stroke` attributes. That flaw was reported by class_nzm and appears to be tracked as `CVE-2026-35545`, extending the remediation effort beyond the initial advisory as administrators were urged to move to the latest patched builds.
Jun 29, 2026
Roundcube has released **Webmail 1.6.18** and **1.7.3** to fix **11 security vulnerabilities**, led by **`CVE-2026-74997`**, a high-severity remote code execution flaw in the **markasjunk** plugin’s **`cmd_learn`** driver. The bug, classified as **CWE-78**, affects **Roundcube 1.6.x before 1.6.18** and **1.7.x before 1.7.3** and can be triggered through crafted placeholder replacement values, potentially allowing command execution on the mail server with impacts to confidentiality, integrity, and availability. Roundcube urged all production deployments to upgrade, and administrators were advised to disable the **markasjunk** plugin if it is not needed. The security updates also address SSRF filter bypasses, remote content blocking bypass, LDAP filter injection, arbitrary Sieve script injection, IMAP command injection, stored XSS, HTML/CSS sanitization bypasses, and a **modoboa** password-driver issue that could leak an authentication token to a user-controlled host. Roundcube said the flaws could expose webmail environments to mail theft, persistence, and lateral movement if left unpatched, and recommended restricting outbound connectivity from Roundcube hosts in addition to applying the new releases.
Aug 18, 2026