XSS in Roundcube Webmail
CVE-2024-42009
A Cross-Site Scripting vulnerability in Roundcube through 1.5.7 and 1.6.x through 1.6.7 allows a remote attacker to steal and send emails of a victim via a crafted e-mail message that abuses a Desanitization issue in message_body() in prog…
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.844 (99.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N.
Affected products
- Roundcube Webmail
- N/a — versions n/a
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Public proof-of-concept exploits
References
- cve@mitre.org (Release Notes)
- cve@mitre.org (Technical Description, Third Party Advisory)
- cve@mitre.org (Release Notes)
- cve@mitre.org (Release Notes)
- cve@mitre.org (Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2024-42009?
- CVE-2024-42009 is a critical-severity vulnerability in Roundcube Webmail, classified under Cross-site Scripting. CVSS score: 9.3/10. Published 2024-08-05.
- How severe is CVE-2024-42009?
- Critical severity. CVSS v3 base score is 9.3 out of 10.
- Is CVE-2024-42009 known to be exploited?
- Yes. CVE-2024-42009 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-06-09), indicating it is being actively exploited. 15 public proof-of-concept repositories are indexed.