CVE-2026-75003 Security feature bypass in Webmail

What is CVE-2026-75003?

CVE-2026-75003 is a medium-severity vulnerability in Roundcube Webmail, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In Roundcube Webmail before 1.6.18 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.

Weakness: CWE-669

Which versions are affected by CVE-2026-75003?

It affects 1 product.

Products include Roundcube Webmail.

How do I fix CVE-2026-75003?

Upgrade to a fixed version.

Is CVE-2026-75003 being exploited?

There is no known exploitation of CVE-2026-75003 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-2026-75003, GHSA-mh9g-rh94-w7mh, UBUNTU-CVE-2026-75003.