Vulnerability in Roundcube Webmail
CVE-2026-75003
In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, an unclosed url() in a FuncIRI attribute of an SVG image could evade the remote image blocking, which may lead to information disclosure or privilege escalation.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (45.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003
Affected products
- Roundcube Webmail — versions 1.6.0, 1.7.0
Weakness classification (CWE)
References
- roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3 (Vendor Advisory)
- github.com/roundcube/roundcubemail/releases/tag/1.6.18 (Release Notes)
- github.com/roundcube/roundcubemail/commit/1cebea03474305d9f75a9a33d30880d290b55… (Patch)
- github.com/roundcube/roundcubemail/releases/tag/1.7.3 (Release Notes)
- github.com/roundcube/roundcubemail/commit/440277c32e6d84f3d116153af1cc8454361a8… (Patch)
Frequently asked questions
- What is CVE-2026-75003?
- CVE-2026-75003 is a medium-severity vulnerability in Roundcube Webmail, classified under Incorrect Resource Transfer Between Spheres. CVSS score: 5.8/10. Published 2026-08-17.
- How severe is CVE-2026-75003?
- Medium severity. CVSS v3 base score is 5.8 out of 10.