Description

Uncaught Exception (CWE-248) in Kibana Cases can lead to denial of service via Input Data Manipulation (CAPEC-153). Malformed link syntax stored in a case comment was not rejected or sanitized when the comment was later formatted for display, and the resulting unhandled error prevented the affected case from being displayed. An authenticated user holding privileges to comment on a case could store such a comment, after which that case became inaccessible to every user who opened it until the stored comment was removed.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "4.3",
  "pubDate": "2026-08-13T20:17:22.600Z",
  "pubdate": "2026-08-13T20:17:22.600Z",
  "executiveSummary": "An Uncaught Exception vulnerability (CWE-248) has been identified in Kibana Cases, leading to a denial of service condition via Input Data Manipulation (CAPEC-153).\nThe vulnerability allows an authenticated user with case-commenting privileges to cause a persistent denial of service affecting the display of specific cases for all users.\nThe root cause stems from the lack of rejection or sanitization of malformed link syntax stored within case comments.\nWhen a user opens an affected case, the system attempts to format the malicious comment for display, triggering an unhandled error that prevents the case interface from rendering entirely.\nExploitation requires authenticated access and specific privileges to add comments to a case within Kibana Cases.\nThe risk implication is operational disruption, rendering targeted cases permanently inaccessible via the user interface until the offending database record or stored comment is manually removed.\nNo remote code execution or data exfiltration capabilities are conferred by this specific vulnerability vector, but availability is directly compromised.",
  "technicalDetails": "The vulnerability resides within the comment rendering and formatting logic of Kibana Cases.\nThe affected component fails to properly validate, sanitize, or parse incoming link syntax when storing and subsequently rendering case comments.\nAn authenticated attacker possessing permissions to create comments on a case can exploit this flaw by submitting a payload containing malformed link syntax.\nThe step-by-step attack flow begins with the attacker crafting a malicious comment containing the malformed link structure.\nThe attacker posts this comment to a target case leveraging standard application functionality, resulting in the malicious syntax being successfully persisted within the backend data store.\nSubsequently, any authenticated user attempts to view the affected case via the Kibana web interface.\nDuring the rendering phase, the application attempts to process and format the stored comment for display.\nDue to the absence of input validation and exception handling, parsing the malformed link syntax generates a runtime error that results in an uncaught exception (CWE-248).\nThis unhandled exception disrupts the React component lifecycle or backend rendering pipeline, causing the entire case view to fail to load.\nConsequently, the case becomes persistently inaccessible to all users, including administrators, whenever the page is requested, until administrative backend intervention removes the offending comment data."
}