CVE-2020-35730
Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 13 July 2023). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 32.92% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 22 June 2023 · due 13 July 2023
- Weakness
- CWE-79
- Affected
- roundcube/webmail · fedoraproject/fedora · debian/debian linux
- Source
- cve@mitre.org
EPSS 32.9% since 30 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. https://roundcube.net/news/2020/12/27/security-updates-1.4.10-1.3.16-and-1.2.13; https://nvd.nist.gov/vuln/detail/CVE-2020-35730
References
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=978491Issue Tracking, Mailing List
- https://github.com/roundcube/roundcubemail/compare/1.4.9...1.4.10Patch
- https://github.com/roundcube/roundcubemail/releases/tag/1.2.13Release Notes
- https://github.com/roundcube/roundcubemail/releases/tag/1.3.16Release Notes
- https://github.com/roundcube/roundcubemail/releases/tag/1.4.10Release Notes
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HCEU4BM5WGIDJWP6Z4PCH62ZMH57QYM2/Mailing List, Release Notes
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HMLIZWKMTRCLU7KZLEQHELS4INXJ7X5Q/Mailing List, Release Notes
- https://roundcube.net/download/Product
- https://www.alexbirnberg.com/roundcube-xss.htmlBroken Link
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=978491Issue Tracking, Mailing List
- https://github.com/roundcube/roundcubemail/compare/1.4.9...1.4.10Patch
- https://github.com/roundcube/roundcubemail/releases/tag/1.2.13Release Notes
- https://github.com/roundcube/roundcubemail/releases/tag/1.3.16Release Notes
- https://github.com/roundcube/roundcubemail/releases/tag/1.4.10Release Notes
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HCEU4BM5WGIDJWP6Z4PCH62ZMH57QYM2/Mailing List, Release Notes
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HMLIZWKMTRCLU7KZLEQHELS4INXJ7X5Q/Mailing List, Release Notes
- https://roundcube.net/download/Product
- https://www.alexbirnberg.com/roundcube-xss.htmlBroken Link
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-35730US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.