Vulnerability in Roundcube Webmail
CVE-2026-35545
An issue was discovered in Roundcube Webmail before 1.5.15 and 1.6.15. The remote image blocking feature can be bypassed via SVG content in an e-mail message. This may lead to information disclosure or access-control bypass. This involves the animate element with attributeName=fill/filter/stroke.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.005 (43.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.002
Affected products
- Roundcube Webmail — versions 0, 1.6.0
Weakness classification (CWE)
References
- roundcube.net/news/2026/03/29/security-updates-1.7-rc6-1.6.15-1.5.15 (Vendor Advisory)
- github.com/roundcube/roundcubemail/releases/tag/1.7-rc6 (Release Notes)
- github.com/roundcube/roundcubemail/commit/7ad62de184368bf42c0f522d1aacc030f5ddc… (Patch)
- github.com/roundcube/roundcubemail/releases/tag/1.6.15 (Release Notes)
- github.com/roundcube/roundcubemail/commit/9d18d524f3cc211003fc99e2e54eed09a2f3d… (Patch)
- github.com/roundcube/roundcubemail/releases/tag/1.5.15 (Release Notes)
- github.com/roundcube/roundcubemail/commit/fe1320b199d3a2f58351bb699c9ed4316e732… (Patch)
Frequently asked questions
- What is CVE-2026-35545?
- CVE-2026-35545 is a medium-severity vulnerability in Roundcube Webmail, classified under Incorrect Resource Transfer Between Spheres. CVSS score: 5.3/10. Published 2026-04-03.
- How severe is CVE-2026-35545?
- Medium severity. CVSS v3 base score is 5.3 out of 10.