CVE-2017-6820 — rcube_utils

rcube_utils.php in Roundcube before 1.1.8 and 1.2.x before 1.2.4 is susceptible to a cross-site scripting vulnerability via a crafted Cascading Style Sheets (CSS) token sequence within an SVG element.

01What is this vulnerability?

rcube_utils.php in Roundcube before 1.1.8 and 1.2.x before 1.2.4 is susceptible to a cross-site scripting vulnerability via a crafted Cascading Style Sheets (CSS) token sequence within an SVG element.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2017-03-12T05:59:00.277
• Last modified: 2026-05-13T00:24:29.033

09References

• www.securityfocus.com — http://www.securityfocus.com/bid/96817
• github.com — https://github.com/roundcube/roundcubemail/commit/cbd35626f7db7855f3b5e2db00d28e…
• github.com — https://github.com/roundcube/roundcubemail/commit/fa2824fdcd44af3f970b2797feb476…
• github.com — https://github.com/roundcube/roundcubemail/releases/tag/1.1.8
• github.com — https://github.com/roundcube/roundcubemail/releases/tag/1.2.4
• github.com — https://github.com/roundcube/roundcubemail/wiki/Changelog#release-124
• roundcube.net — https://roundcube.net/news/2017/03/10/updates-1.2.4-and-1.1.8-released
• www.securityfocus.com — http://www.securityfocus.com/bid/96817
• github.com — https://github.com/roundcube/roundcubemail/commit/cbd35626f7db7855f3b5e2db00d28e…
• github.com — https://github.com/roundcube/roundcubemail/commit/fa2824fdcd44af3f970b2797feb476…