CVE-2026-62643 Server-side request forgery in Webmail

What is CVE-2026-62643?

CVE-2026-62643 is a high-severity server-side request forgery vulnerability in Roundcube Webmail, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-918

Which versions are affected by CVE-2026-62643?

It affects 1 product.

Products include Roundcube Webmail.

How do I fix CVE-2026-62643?

Upgrade to a fixed version.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2026-62643 being exploited?

There is no known exploitation of CVE-2026-62643 in the wild and no public exploit code.

Other vulnerabilities in Roundcube Webmail

• CVE-2024-42009 RoundCube Webmail Cross-Site Scripting Exploited Critical 9.3
• CVE-2025-68461 RoundCube Webmail Cross-site Scripting Exploited High 7.2
• CVE-2008-5619 PHPMailer susceptible to arbitrary code execution Critical 10.0
• CVE-2024-37385 Command injection in n/a Critical 9.8
• CVE-2024-42008 Cross-site scripting in n/a Critical 9.3

All Roundcube Webmail vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-62643, GHSA-5q79-cfqm-5cxh, UBUNTU-CVE-2026-62643.