Critical severity · published Jul 14, 2026
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…
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WE
Webmail · Roundcube
1.6.0 before 1.6.17; 1.7.0 before 1.7.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-62644
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-62644
Patch
https://github.com/roundcube/roundcubemail/commit/5cdc6a48b40beabff7f0bf5d9035f4491e877e4c
Patch
https://github.com/roundcube/roundcubemail/commit/7414fef51cd2407d39faab99680763f10ed5231d
Patch
https://github.com/roundcube/roundcubemail/commit/83150ce04d689a70f92d511bcae40adba8d55476
Patch
https://github.com/roundcube/roundcubemail/commit/9a96c20d8c7c9135876b68bebd6960af3ee60923
Release Notes
https://github.com/roundcube/roundcubemail/releases/tag/1.6.17
Release Notes
https://github.com/roundcube/roundcubemail/releases/tag/1.7.2
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