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A critical SQL-injection flaw in Roundcube Webmail's virtuser_query plugin, tracked as CVE-2026-48842, is being actively exploited in the wild. The pre-authentication vulnerability stems from a backslash-escaping bypass in PHP's preg_replace handling and can allow an attacker to manipulate database queries before logging in, provided the vulnerable plugin is enabled and reachable.
The Canadian Centre for Cyber Security cited open-source reporting confirming exploitation and urged organizations to act immediately. Affected deployments include Roundcube versions earlier than 1.6.16 in the 1.6 LTS branch and earlier than 1.7.1 in the 1.7 branch; administrators should update exposed instances, verify whether virtuser_query is enabled, and review web, application, database, and authentication logs for compromise indicators.
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2 events from the most recent confirmed update back to the earliest known activity.
The Canadian Center for Cyber Security updated advisory AV26-503, citing open-source reporting that the pre-authentication SQL-injection flaw CVE-2026-48842 was being actively exploited in the wild.
Roundcube published security advisories addressing multiple flaws in its webmail platform, including remediation for the virtuser_query SQL-injection issue.
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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 **1.6.11** and **1.5.10** to fix **CVE-2025-49113**, a critical post-authentication remote code execution flaw in its open-source webmail platform. The vulnerability affects versions earlier than **1.6.11** and the LTS branch earlier than **1.5.10**, and stems from improper sanitization of the `_from` parameter in `/program/actions/settings/upload.php`, which can lead to **PHP object deserialization** and arbitrary code execution. Researchers and national defenders reported that the flaw is being **actively exploited** and that public analysis of the June hotfix helped attackers develop working exploits. FearsOff published technical research and proof-of-concept details, while CSIRT.SK said exploit code is being sold on hacker forums and warned that attackers may obtain the required authenticated access through phishing, brute-force, or CSRF. Administrators were urged to upgrade immediately and review Roundcube, network, and security logs for signs of compromise.
Jul 24, 2026
Roundcube remediated **CVE-2025-49113**, a serious vulnerability that allows an authenticated attacker to execute arbitrary code remotely on affected Roundcube Webmail servers. Successful exploitation could enable exposure of sensitive data and compromise of the mail environment. The Dutch National Cyber Security Centre reported that public exploit code is circulating, raising the likelihood of abuse, and rated both likelihood and impact as High. Organizations running the 1.6.x branch should upgrade to **1.6.11**, while those using the 1.5.x LTS branch should upgrade to **1.5.10** as soon as possible.
Aug 31, 2026