Vulnerability · Published Jul 14, 2026 · Assigned by mitre
CVE-2026-62644
Medium 6.4
In plain English
A medium-severity authentication bypass by spoofing in Webmail from Roundcube. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.4Medium
Exploit odds (30 days)0.3%top 82.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | roundcube | 1.6.5+dfsg-1+deb12u10 | DEBIAN-CVE-2026-62644 |
| Debian:13 | roundcube | 1.6.17+dfsg-0+deb13u1 | DEBIAN-CVE-2026-62644 |
| Debian:14 | roundcube | 1.6.17+dfsg-1 | DEBIAN-CVE-2026-62644 |
| Ubuntu:26.10 | roundcube | no fix listed | UBUNTU-CVE-2026-62644 |
Affected products (as reported)
Weakness: CWE-290 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
References
- https://roundcube.net/news/2026/07/05/security-updates-1.6.17-and-1.7.2
- https://github.com/roundcube/roundcubemail/releases/tag/1.7.2
- https://github.com/roundcube/roundcubemail/commit/7414fef51cd2407d39faab99680763f10ed5231d
- https://github.com/roundcube/roundcubemail/commit/9a96c20d8c7c9135876b68bebd6960af3ee60923
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.17
- https://github.com/roundcube/roundcubemail/commit/83150ce04d689a70f92d511bcae40adba8d55476
- https://github.com/roundcube/roundcubemail/commit/5cdc6a48b40beabff7f0bf5d9035f4491e877e4c