CVE-2020-35730 on CISA KEV

An XSS issue was discovered in Roundcube Webmail before 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10. The attacker can send a plain text e-mail message, with JavaScript in a link reference element that is mishandled by linkref_addindex in rcube_string_replacer.php.

01What CISA says about this vulnerability

An XSS issue was discovered in Roundcube Webmail before 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10. The attacker can send a plain text e-mail message, with JavaScript in a link reference element that is mishandled by linkref_addindex in rcube_string_replacer.php.

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• roundcube.net — https://roundcube.net/download/
• github.com — https://github.com/roundcube/roundcubemail/compare/1.4.9...1.4.10
• bugs.debian.org — https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=978491
• www.alexbirnberg.com — https://www.alexbirnberg.com/roundcube-xss.html
• github.com — https://github.com/roundcube/roundcubemail/releases/tag/1.4.10
• github.com — https://github.com/roundcube/roundcubemail/releases/tag/1.3.16
• github.com — https://github.com/roundcube/roundcubemail/releases/tag/1.2.13
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
n	a / n/a	n/a

06Detection

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