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Exploited vulnerability · CISA KEV

Is CVE-2024-42009 exploited? Yes: in CISA KEV since 9 Jun 2025

Gociux · Roundcube Webmail · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2024-42009, RoundCube Webmail Cross-Site Scripting Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 9 Jun 2025, 308 days after it was published. It affects Roundcube Webmail. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 9 Jun 2025
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.3CVSS 3.1 · critical
US federal due30 Jun 2025BOD 22-01 deadline

What it is

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.

VendorRoundcube (11 exploited CVEs in KEV)
ProductWebmail
VulnerabilityRoundCube Webmail Cross-Site Scripting Vulnerability
WeaknessCWE-79
Published5 Aug 2024
Added to KEV9 Jun 2025
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Webmail in your asset inventory, including appliances and cloud images. Stack check lists every exploited Roundcube CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 5 Aug 2024.
  4. Get told next time. Email alerts when CISA adds a CVE for Roundcube.

Other exploited CVEs in Webmail

References

Questions

Is CVE-2024-42009 being exploited?

Yes. CISA added CVE-2024-42009 to the Known Exploited Vulnerabilities catalog on 9 Jun 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2024-42009 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2024-42009?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Roundcube's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Webmail and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in June 2025 · Roundcube scorecard · act-now radar.

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