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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.
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5 events from the most recent confirmed update back to the earliest known activity.
MITRE received CVE-2026-74997 on 2026-08-17 for the Roundcube Webmail markasjunk plugin remote code execution vulnerability. The flaw is classified as CWE-78 and carries a high-impact CVSS v3.1 vector of AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
On 2026-08-09, Roundcube also patched LDAP filter injection, arbitrary Sieve script injection, IMAP command injection, stored XSS in the Add to address book action, and HTML/CSS sanitization bypasses. The same updates also fixed a password modoboa driver issue that could leak an authentication token to a user-controlled host.
In the 2026-08-09 releases, Roundcube fixed SSRF bypasses in local URL validation, including abuse of 100.64.0.0/10 and fe80::/10 address ranges and crafted nip.io or sslip.io hostnames. The issues were reported by Dmytro Ivanenko and Milan Hoppe.
The 2026-08-09 Roundcube security releases patched a remote code execution flaw in the markasjunk plugin's cmd_learn driver, reported by nept1337. The issue affects Roundcube 1.6.x before 1.6.18 and 1.7.x before 1.7.3 and could allow command execution through crafted placeholder replacement values.
On 2026-08-09, Roundcube released versions 1.6.18 and 1.7.3 as security updates for the 1.6 and 1.7 branches, recommending production installations upgrade. The releases fixed multiple recently reported vulnerabilities across the webmail platform.
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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 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.
Sep 7, 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