CVE-2020-35730
Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability
- Medium 6.1
- Exploited: added to CISA KEV 22 Jun 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.
Key facts
- Published
- 28 Dec 2020
- Last changed
- 21 Oct 2025
- Assigned by
- mitre
- KEV added
- 22 Jun 2023
- KEV fix due
- 13 Jul 2023
- EPSS
- 30.944% likely to be exploited in the next 30 days, higher than 98.286% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: partial
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 6.1CVSS 3.1, Mediumfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a |
|
Timeline
- 28 Dec 2020 Published
- 22 Jun 2023 CVE-2020-35730 added to CISA KEV
- 22 Jun 2023 Added to the CISA KEV catalogue
Weakness
Practice this bug class
HackZoneLabs has a hands-on lab on XSS (stored, reflected, DOM) (CWE-79).