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PatchSiren cyber security CVE debrief

CVE-2023-43770 Roundcube CVE debrief

CVE-2023-43770 is a persistent cross-site scripting (XSS) issue in Roundcube Webmail that CISA added to the Known Exploited Vulnerabilities catalog on 2024-02-12. That KEV listing is the strongest signal in the supplied corpus that this issue should be treated as actively exploited or otherwise operationally important. For defenders, the practical takeaway is straightforward: prioritize remediation on any Roundcube deployment, especially if it is externally reachable or used by many users. Follow vendor guidance referenced by CISA, validate the fix in your environment, and plan to meet the KEV due date where possible.

Vendor
Roundcube
Product
Webmail
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2024-02-12
Original CVE updated
2024-02-12
Advisory published
2024-02-12
Advisory updated
2024-02-12

Who should care

Roundcube administrators, email and webmail platform owners, security teams responsible for internet-facing web applications, and organizations that rely on Roundcube for user messaging.

Technical summary

The supplied corpus identifies CVE-2023-43770 as a persistent XSS vulnerability in Roundcube Webmail. Persistent XSS means malicious content can be stored and later rendered in a user’s browser, which can expose users to script execution in the webmail context. CISA’s KEV entry names the product as Roundcube Webmail, lists the issue as known exploited, and points to Roundcube’s security update 1.6.3 and the NVD record for further detail. The corpus does not provide affected-version specifics or a CVSS score.

Defensive priority

High. CISA KEV inclusion means this should be prioritized for prompt remediation on any affected Roundcube Webmail installation. The supplied KEV metadata sets a due date of 2024-03-04, so exposed deployments should be addressed ahead of that date if at all possible.

Recommended defensive actions

  • Review Roundcube’s vendor guidance referenced by CISA and apply the security update noted in the corpus (Roundcube security update 1.6.3) or a later fixed release.
  • If you cannot mitigate promptly, follow CISA’s guidance to discontinue use of the product until mitigations are available.
  • Inventory all Roundcube Webmail deployments, especially internet-facing instances, and confirm whether they are still in service.
  • Validate the remediation in a staging environment before production rollout, then confirm the live system is updated and monitored.
  • Track the issue to completion before the KEV due date and document the remediation status for your vulnerability program.

Evidence notes

The supplied source corpus is limited to the CISA Known Exploited Vulnerabilities record and official reference links. CISA’s metadata identifies the issue as “Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability,” sets dateAdded to 2024-02-12 and dueDate to 2024-03-04, and includes notes referencing Roundcube’s security update 1.6.3 release and the NVD entry for CVE-2023-43770. No CVSS score, affected-version list, or full vendor advisory text was included in the corpus.

Official resources

CISA publicly listed CVE-2023-43770 in the Known Exploited Vulnerabilities catalog on 2024-02-12, with remediation due by 2024-03-04. The supplied corpus uses 2024-02-12 as both the CVE publication and modification date.