Vulnerability · Published May 25, 2026 · Assigned by mitre
CVE-2026-48849
Medium 4.4
In plain English
A medium-severity cross-site scripting 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 0.2% (higher than 15% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.4Medium
Exploit odds (30 days)0.2%top 85.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
In Roundcube Webmail 1.6.x before 1.6.16 and 1.7.x before 1.7.1, an unsanitized subject field in the draft restored value could lead to stored XSS/HTML/CSS injection on shared mailboxes.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | roundcube | 1.6.5+dfsg-1+deb12u9 | DEBIAN-CVE-2026-48849 |
| Debian:13 | roundcube | 1.6.16+dfsg-0+deb13u1 | DEBIAN-CVE-2026-48849 |
| Debian:14 | roundcube | 1.6.16+dfsg-1 | DEBIAN-CVE-2026-48849 |
| Ubuntu:25.10 | roundcube | no fix listed | UBUNTU-CVE-2026-48849 |
| Ubuntu:26.10 | roundcube | no fix listed | UBUNTU-CVE-2026-48849 |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
References
- https://roundcube.net/news/2026/05/24/security-updates-1.6.16-and-1.7.1
- https://github.com/roundcube/roundcubemail/releases/tag/1.7.1
- https://github.com/roundcube/roundcubemail/commit/189d30a4890319cd687df959ca9f768a3a613d61
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.16
- https://github.com/roundcube/roundcubemail/commit/a21519187873ce962db029b6ff68e47bd7f3fd8a