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Vulnerability record · CVE-2026-35537 · published 3 April 2026

CVE-2026-35537: Roundcube webmail deserialization of untrusted data vulnerability

Roundcube · Webmail

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.

7.5 CVSS 3.1 High EPSS 0.60% · top 53.4% CWE-502 · Deserialization of untrusted data
7.5CVSS 3.1 base score
0.60%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
24 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/roundcube/roundcubemail/commit/618c5428edc69fb088e7ac6c89e506dd39df3 Patch
https://github.com/roundcube/roundcubemail/commit/6d586cfa4d8a31f7957f7a445aaedd52592a0e74 Patch
https://github.com/roundcube/roundcubemail/commit/a4ead994d2f0ea92e4a1603196a197e0d5df1620 Patch
https://github.com/roundcube/roundcubemail/releases/tag/1.5.14 Release Notes
https://github.com/roundcube/roundcubemail/releases/tag/1.6.14 Release Notes
https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5 Release Notes
https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14 Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/04/11/6 Issue TrackingMailing List

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Source: NIST National Vulnerability Database (record CVE-2026-35537), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.