CVE-2026-35537
Roundcube Webmail: Unsafe deserialization in the redis/memcache session handler
3.7
LOW
CVSS 3.1
EPSS 0.05%
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.
How to fix CVE-2026-35537
To remediate CVE-2026-35537, upgrade the affected package to a fixed version below.
- —upgrade to 1.6.5+dfsg-1+deb12u8 or later
- —upgrade to 1.7-rc5 or later
Is CVE-2026-35537 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 1.6.5+dfsg-1+deb12u8
- >= 1.7-beta, < 1.7-rc5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N |