What’s Vulnerable › Vulnerabilities

CVE-2026-35537

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-03 · updated 2026-07-24
• Weakness: CWE-502

Description

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.

Affected products

• Roundcube Webmail: before 1.5.14; from 1.6.0 before 1.6.14 — fixed in 1.5.14, 1.6.14

How to fix

Upgrade to a fixed version: Roundcube Webmail 1.5.14, 1.6.14. Check the vendor advisory for mitigations.

References

• https://github.com/roundcube/roundcubemail/commit/618c5428edc69fb088e7ac6c89e506dd39df3
• https://github.com/roundcube/roundcubemail/commit/6d586cfa4d8a31f7957f7a445aaedd52592a0e74
• https://github.com/roundcube/roundcubemail/commit/a4ead994d2f0ea92e4a1603196a197e0d5df1620
• https://github.com/roundcube/roundcubemail/releases/tag/1.5.14
• https://github.com/roundcube/roundcubemail/releases/tag/1.6.14
• https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5
• https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14
• http://www.openwall.com/lists/oss-security/2026/04/11/6

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