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

criticalknown exploitedpublic exploitCVE-2020-35730
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: RoundcubeCross-site scripting
What
A cross-site scripting (XSS) vulnerability allows an attacker to send a plain text e-mail message with Javascript.
Who is affected
Users of Roundcube Webmail.
Urgency
Remediation is urgent as the vulnerability is critical and actively exploited.
Action
Update to the latest version of Roundcube Webmail.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2023-06-22
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2020-35730

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2020-35730coverage & exploitation statusNVD · CVE.org

Recent advisories for Roundcube Webmail Cross-Site

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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