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PatchSiren cyber security CVE debrief

CVE-2024-42009 Roundcube CVE debrief

CVE-2024-42009 is a Roundcube Webmail cross-site scripting issue that CISA added to the Known Exploited Vulnerabilities catalog on 2025-06-09. Because it is in KEV, defenders should treat exposure as urgent and follow the vendor’s security-update guidance referenced by CISA. If mitigations are not available, CISA advises discontinuing use of the product.

Vendor
Roundcube
Product
Webmail
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2025-06-09
Original CVE updated
2025-06-09
Advisory published
2025-06-09
Advisory updated
2025-06-09

Who should care

Administrators and security teams running Roundcube Webmail, managed service providers hosting it, cloud mail platform operators, and incident responders responsible for email-facing web applications.

Technical summary

The supplied official sources identify CVE-2024-42009 as a Cross-Site Scripting vulnerability in Roundcube Webmail. The CISA KEV entry confirms known exploitation and sets a remediation due date of 2025-06-30. The source note points to Roundcube security updates 1.6.8 and 1.5.8 as the vendor-linked remediation reference. No CVSS score or deeper attack-precondition details were included in the supplied corpus.

Defensive priority

Immediate

Recommended defensive actions

  • Inventory all Roundcube Webmail deployments and confirm whether they are exposed to users or reachable from the internet.
  • Apply the vendor’s security-update guidance referenced by CISA, including the Roundcube 1.6.8 and 1.5.8 security update notice.
  • If you cannot mitigate promptly, follow CISA guidance for cloud services and consider discontinuing use of the product until remediation is available.
  • Review access, authentication, and application logs for suspicious activity involving Roundcube hosts around the KEV date.
  • Coordinate with hosted-service providers or MSPs to confirm patch status, compensating controls, and remediation timelines before the CISA due date.

Evidence notes

CISA’s KEV feed lists CVE-2024-42009 as “RoundCube Webmail Cross-Site Scripting Vulnerability” for vendor/project Roundcube and product Webmail, with dateAdded 2025-06-09 and dueDate 2025-06-30. The KEV note also references the Roundcube security updates 1.6.8 and 1.5.8 page and the NVD detail page. The supplied corpus does not include a CVSS score or additional technical detail beyond the XSS classification and known-exploitation status.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-42009 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-42009

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2024-42009 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-42009

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.