Vulnerability in Roundcube Webmail
CVE-2026-62644
In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, the password plugin of the Roundcube Webmail was subject to username spoofing via session data, which could lead to account takeover.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (41.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Roundcube Webmail — versions 1.6.0, 1.7.0
Weakness classification (CWE)
References
- github.com/roundcube/roundcubemail/commit/5cdc6a48b40beabff7f0bf5d9035f4491e877… (Patch)
- github.com/roundcube/roundcubemail/commit/7414fef51cd2407d39faab99680763f10ed52… (Patch)
- github.com/roundcube/roundcubemail/commit/83150ce04d689a70f92d511bcae40adba8d55… (Patch)
- github.com/roundcube/roundcubemail/commit/9a96c20d8c7c9135876b68bebd6960af3ee60… (Patch)
- github.com/roundcube/roundcubemail/releases/tag/1.6.17 (Release Notes)
- github.com/roundcube/roundcubemail/releases/tag/1.7.2 (Release Notes)
- roundcube.net/news/2026/07/05/security-updates-1.6.17-and-1.7.2 (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-62644?
- CVE-2026-62644 is a medium-severity vulnerability in Roundcube Webmail, classified under Authentication Bypass by Spoofing. CVSS score: 6.4/10. Published 2026-07-14.
- How severe is CVE-2026-62644?
- Medium severity. CVSS v3 base score is 6.4 out of 10.