CVE-2026-62643: webmail SSRF — Fix

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.

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CVSS v3.1 Score

7.2

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0025

Probability of exploitation

0.16%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Vendor	Product	Versions
roundcube	webmail	1.6.0 — 1.6.17
roundcube	webmail	1.7.0 — 1.7.2

References

Advisories & Patches

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

Other References

https://github.com/roundcube/roundcubemail/releases/tag/1.6.17 https://github.com/roundcube/roundcubemail/releases/tag/1.7.2

Frequently Asked Questions

What is CVE-2026-62643? +

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. It has a CVSS v3.1 base score of 7.2 (HIGH).

How severe is CVE-2026-62643? +

CVE-2026-62643 has a CVSS v3.1 score of 7.2 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0025, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-62643? +

CVE-2026-62643 affects products from roundcube, specifically: webmail. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-62643? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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