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High 7.2Published Aug 17, 2026
CVE-2026-74998In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, responses from the CSS (Cascading Style Sheets) proxy were not validated, which may result in information disclosure or XSS (cross-site scri…
Updated under an hour ago ()
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In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, responses from the CSS (Cascading Style Sheets) proxy were not validated, which may result in information disclosure or XSS (cross-site scripting) via MIME sniffing.
- CVSS
- 7.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- Weakness (CWE)
- CWE-79
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mitre
- NVD analysis
- Analyzed
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Roundcube Webmail roundcube:webmail (from the name) | from 1.6.0 before 1.6.18; from 1.7.0 before 1.7.3 | CNA record |
roundcube webmail roundcube:webmail | from 1.6.0 before 1.6.18; from 1.7.0 before 1.7.3 | NVD |
References
- https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3vendor-advisory
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.18release-notes
- https://github.com/roundcube/roundcubemail/commit/62d33c8a0dc3fd0dd03984220dc9709e8e0de43bpatch
- https://github.com/roundcube/roundcubemail/releases/tag/1.7.3release-notes
- https://github.com/roundcube/roundcubemail/commit/a2334990c02f7cb77b1a8d6fa97fcd9e1b5cd1fbpatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.