CVE-2026-35537

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Unsafe deserialization in the redis/memcache session handler may lead to arbitrary file write operations by unauthenticated attackers via crafted session data.

• CWE-502

• https://github.com/roundcube/roundcubemail/commit/618c5428edc69fb088e7ac6c89e506dd39df3Patch
• https://github.com/roundcube/roundcubemail/commit/6d586cfa4d8a31f7957f7a445aaedd52592a0e74Patch
• https://github.com/roundcube/roundcubemail/commit/a4ead994d2f0ea92e4a1603196a197e0d5df1620Patch
• https://github.com/roundcube/roundcubemail/releases/tag/1.5.14Release Notes
• https://github.com/roundcube/roundcubemail/releases/tag/1.6.14Release Notes
• https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5Release Notes
• https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14Third Party Advisory
• http://www.openwall.com/lists/oss-security/2026/04/11/6Issue Tracking, Mailing List

Published

Apr 3, 2026

Last Modified

Jul 24, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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