CVE-2020-35730Roundcube Webmail Cross-Site Scripting (XSS) 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.

6.1 MEDIUMEPSS 32.92%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-06-17 03:14 UTC

OverviewCVSS details

6.1MEDIUMCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Dec 28, 2020
Assigner: mitre

Affected

webmail (roundcube)

Versions: before 1.2.13 · 1.3.0 before 1.3.16
Fixed in: 1.2.13, 1.3.16, 1.4.10

+2 more products →

Exploitation

Public exploit: None listed
CISA KEV: Listed · Jun 22, 2023
KEV due date: Jul 13, 2023
Ransomware use: Unknown
SSVC: Exploitation active · Automatable no · Impact partial

EPSS · FIRST, scored Nov 7

32.92%chance of exploitation in 30 days

Higher than 98.36% of CVEs

CVSS 3.1 · NVD

6.1Medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: Required
Scope: Changed
Confidentiality impact: Low
Integrity impact: Low
Availability impact: None

CVSS 2.0 · NVD

4.3Medium

AV:N/AC:M/Au:N/C:N/I:P/A:N

Attack vector: Network
Attack complexity: Medium
Authentication: None
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
6.1	MEDIUM	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3	MEDIUM	2.0NVD	AV:N/AC:M/Au:N/C:N/I:P/A:N

CISA required action

⚡ Known exploited · remediation due Jul 13, 2023

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Details

CVE ID: CVE-2020-35730
Status: Analyzed
Assigner (CNA): mitre
Published: Dec 28, 2020
Last modified: 2026-06-17 03:14 UTC
Weaknesses: CWE-79

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 14:12 UTC.