CVE-2026-35537

HIGH EPSS 37.5%
Published Apr 3, 20262mo ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published Apr 3, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
37.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-502 Deserialization of Untrusted Data Validation

Affected Products 2

VendorProductVersionRange
roundcubewebmail* <1.5.14
roundcubewebmail*≥1.6.0  –  <1.6.14

References 8

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

Remediation

  • github.com https://github.com/roundcube/roundcubemail/commit/618c5428edc69fb088e7ac6c89e506dd39df3
    Patch
  • github.com https://github.com/roundcube/roundcubemail/commit/6d586cfa4d8a31f7957f7a445aaedd52592a0e74
    Patch
  • github.com https://github.com/roundcube/roundcubemail/commit/a4ead994d2f0ea92e4a1603196a197e0d5df1620
    Patch