What’s Vulnerable › Vulnerabilities

CVE-2026-62643

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-14 · updated 2026-10-24
• Weakness: CWE-918

Description

In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts. NOTE: this issue exists because of insufficient fixes for CVE-2026-35540 and CVE-2026-48843.

Affected products

• Roundcube Webmail: from 1.6.0 before 1.6.17; from 1.7.0 before 1.7.2 — fixed in 1.6.17, 1.7.2

How to fix

Upgrade to a fixed version: Roundcube Webmail 1.6.17, 1.7.2. Check the vendor advisory for mitigations.

References

• https://github.com/roundcube/roundcubemail/commit/294c7da6e7284166f040cef8607b677d459e0786
• https://github.com/roundcube/roundcubemail/commit/6d69e094d55d3a9a84dfb36edf6ca985311f0c1c
• https://github.com/roundcube/roundcubemail/releases/tag/1.6.17
• https://github.com/roundcube/roundcubemail/releases/tag/1.7.2
• https://roundcube.net/news/2026/07/05/security-updates-1.6.17-and-1.7.2

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