Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2020-35730

CVE-2020-35730MEDIUM

n/a n/a — Roundcube Roundcube Webmail

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  C  L  L  N    6.1   .3269   98.3   YES

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Dec 27  Reserved by mitre
  Dec 28  Published (CNA: mitre)
  Jun 22  Added to CISA KEV, remediation due 2023-07-13

CWE-79 · CNA: mitre · CVSS v3.1 · 10 references · KEV due July 13, 2023

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
December 27, 2020	Reserved	Reserved by mitre
December 28, 2020	Published	Published (CNA: mitre)
June 22, 2023	KEV ADDED	Added to CISA KEV, remediation due 2023-07-13

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-79

References (10)

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=978491 [x_refsource_CONFIRM]
https://github.com/roundcube/roundcubemail/compare/1.4.9...1.4.10 [x_refsource_CONFIRM]
https://github.com/roundcube/roundcubemail/releases/tag/1.2.13 [x_refsource_CONFIRM]
https://github.com/roundcube/roundcubemail/releases/tag/1.3.16 [x_refsource_CONFIRM]
https://github.com/roundcube/roundcubemail/releases/tag/1.4.10 [x_refsource_CONFIRM]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HCEU4BM5WGIDJWP6Z4PCH62ZMH57QYM2/ [vendor-advisory, x_refsource_FEDORA]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HMLIZWKMTRCLU7KZLEQHELS4INXJ7X5Q/ [vendor-advisory, x_refsource_FEDORA]
https://roundcube.net/download/ [x_refsource_MISC]
https://www.alexbirnberg.com/roundcube-xss.html [x_refsource_MISC]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-35730 [government-resource]

Authoritative record: CVE-2020-35730 at cve.org

Weaknesses: CWE-79

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-35730 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.