What products are affected by CVE-2024-42009?

CVE-2024-42009 affects Roundcube Webmail. Refer to the vendor advisory and NVD record for affected versions.

Is there a public exploit for CVE-2024-42009?

Yes. Public exploit code or proof-of-concept has been identified for CVE-2024-42009. This lowers the barrier for exploitation and increases the urgency of patching. Organizations should prioritize remediation immediately.

What is the EPSS score for CVE-2024-42009?

CVE-2024-42009 has an EPSS score of 91.2%, placing it in the 100th percentile. This means it has a 91.2% probability of being exploited in the next 30 days, higher than 100% of all known vulnerabilities. EPSS (Exploit Prediction Scoring System) is maintained by FIRST and uses real-world threat data to estimate exploitation likelihood.

Actively Exploited — CISA KEV

CVE-2024-42009: Roundcube Webmail Vulnerability

Severity: Unknown | CVSS 3.1: N/A | KEV Added: 2025-06-09

What is CVE-2024-42009?

RoundCube Webmail contains a cross-site scripting vulnerability. This vulnerability could allow 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 program/actions/mail/show.php.

Impact Analysis

Exploitation Probability (EPSS): 91.2% chance of exploitation in the next 30 days (100th percentile). This places the vulnerability in the highest risk tier — immediate action is critical.

Exploit Availability

Public exploit code or proof-of-concept is available for CVE-2024-42009. This significantly increases the risk of exploitation, as attackers can use or adapt existing exploit code rather than developing their own. A public exploit reference has been identified. Organizations should treat this as an urgent patching priority.

Is CVE-2024-42009 being exploited?

Yes. CVE-2024-42009 is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, restricted to CVEs with confirmed active exploitation in the wild. CISA added this vulnerability on 2025-06-09. Inclusion in KEV triggers the patching mandate under BOD 22-01 for U.S. federal civilian agencies, with a remediation deadline of 2025-06-30. Additionally, public exploit code is available, which lowers the barrier for attackers.

How to fix CVE-2024-42009

Apply the security update issued by Roundcube for Webmail. If an immediate patch is not possible, consult the vendor advisory for mitigation guidance, restrict network exposure of the affected service, and monitor logs for indicators of exploitation. CISA's Known Exploited Vulnerabilities catalog requires U.S. federal agencies to remediate this vulnerability by the due date shown below under Binding Operational Directive 22-01. Private organizations should treat KEV entries as priority-one patches because active exploitation has been confirmed in the wild.

Related Vulnerabilities

Other actively exploited vulnerabilities affecting Webmail:

CVE-2025-49113 (Critical 9.9) [same product] — Roundcube Webmail before 1.5.10 and 1.6.x before 1.6.11 allows remote code…
CVE-2025-68461 (High 7.2) [same product] — Roundcube Webmail before 1.5.12 and 1.6 before 1.6.12 is prone to a…

Frequently asked questions

Is CVE-2024-42009 critical?

CVE-2024-42009 has a CVSS 3.1 base score of N/A — Unknown severity. Prioritize based on exposure and the active exploitation signal from the KEV listing. The availability of public exploit code further increases the urgency.

Is CVE-2024-42009 being actively exploited?

Yes — CISA added CVE-2024-42009 to the Known Exploited Vulnerabilities catalog on 2025-06-09. Inclusion in KEV means CISA has confirmed in-the-wild exploitation. Public exploit code has also been identified, making exploitation accessible to a broader range of threat actors.

How do I patch CVE-2024-42009?

Apply the security update from Roundcube for Webmail. Federal agencies must remediate by 2025-06-30 under BOD 22-01.

What is the CVSS score for CVE-2024-42009?

CVE-2024-42009 has a CVSS 3.1 base score of N/A, classifying it as Unknown severity.