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Roundcube released versions 1.6.19 and 1.7.4 for the 1.6 LTS and 1.7 branches, remediating 12 vulnerabilities in its webmail platform. The fixes include a zero-click stored cross-site scripting flaw involving injected TNEF MIME tags in attachment URLs, an additional XSS issue in text/enriched email handling, and several email-header injection vulnerabilities that could permit JavaScript execution within an authenticated victim’s webmail session or manipulation of message metadata.
The updates also address cross-user modification of SQL address-book contact groups, multiple bypasses of remote-content blocking, an is_local_url() validation bypass, and a CSS-proxy server-side request forgery bypass that could enable requests to internal resources. Organizations running affected Roundcube 1.6.x or 1.7.x deployments should upgrade promptly to the patched releases.
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Roundcube Webmail released version 1.6.19 for its 1.6 LTS branch and version 1.7.4 for its 1.7 branch, addressing 12 vulnerabilities. The fixes include zero-click stored XSS, email-header injection, address-book access-control, remote-content bypass, URL-validation, and CSS-proxy SSRF issues.
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Roundcube released versions **1.6.17** and **1.7.2** to address multiple security flaws in its webmail platform, including stored cross-site scripting, SSRF bypasses, password plugin issues tied to session-injected usernames, and denial-of-service conditions in TNEF message handling. The advisory highlights **`CVE-2026-54432`**, a stored XSS issue caused by an unescaped attachment MIME type on the attachment-validation warning page, and **`CVE-2026-54433`**, described as a **zero-click stored XSS** triggered during plain-text rendering. The fixes also resolve an infinite loop in the TNEF decoder, expanding the impact beyond browser-side compromise to service disruption risks. A related Nuclei template update added detection coverage for **`CVE-2026-54433`**, reflecting active defender interest in identifying exposed Roundcube instances. Roundcube also warned that the unsupported **1.5 LTS** branch has reached end of support and may remain vulnerable to these issues as well as earlier flaws fixed in **1.6.16** and **1.7.1**.
Jul 22, 2026
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 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