CVE-2020-35730
Actively exploited. CVE-2020-35730 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-06-22) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2020-35730 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
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
- 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.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 98% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2020-35730 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (1)
- criticalexploitedCVE-2020-35730: Roundcube Webmail Cross-Site Scripting (XSS) Vulnerabilitycisa-kev · 2023-06-22
External references
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[](https://www.csirts.com/cve/CVE-2020-35730)