Is CVE-2020-35730 actively exploited?

Yes. CVE-2020-35730 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2020-35730 be exploited remotely?

The attack vector of CVE-2020-35730 has not been classified yet.

What is the CVSS score of CVE-2020-35730?

CVE-2020-35730 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2020-35730

HIGHCISA KEVIN THE WILD

CVE-2020-35730

Published: June 22, 2023

EPSS:64.81%probability of exploitation in 30 daysPercentile:98.4th

Official Description

Roundcube Webmail contains a cross-site scripting (XSS) vulnerability that allows an attacker to send a plain text e-mail message with Javascript in a link reference element that is mishandled by linkref_addinindex in rcube_string_replacer.php.

NVD Source

CISA KEV Advisory

Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability

Added to KEV: 2023-06-22Federal patch deadline: 2023-07-13

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

Roundcube Webmail is susceptible to a cross-site scripting (XSS) vulnerability. An attacker can exploit this by sending a specially crafted plain text email containing JavaScript in a link reference, which is then mishandled. With an EPSS score of 0.64813 and confirmed in-the-wild exploitation, this vulnerability poses a significant risk to user sessions and data integrity.

This vulnerability is actively exploited in the wild and is included in CISA's KEV catalog, confirming its use by threat actors. The nature of XSS vulnerabilities often allows for remote exploitation.

Recommended Action

Update Roundcube Webmail to the latest secure version. Implement robust content security policies (CSPs) to mitigate XSS risks in web applications.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2020-35730 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2020-35730 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.