CVE-2026-26935
Published: 26 February 2026
Summary
CVE-2026-26935 is a medium-severity Improper Input Validation (CWE-20) vulnerability in Elastic Kibana. Its CVSS base score is 6.5 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 26.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Security testing and developer training directly verify and enforce proper input validation, reducing exploitability of injection and malformed-data weaknesses.
Security testing and evaluation at multiple SDLC stages directly detects missing or flawed input validation, with the required remediation process ensuring fixes are applied.
Directly implements checks on information inputs to reject invalid data before processing.
Spam protection mechanisms perform filtering and detection on inbound/outbound messages, directly compensating for missing or weak input validation of unsolicited content.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Improper input validation in Kibana search endpoint directly enables authenticated remote DoS via application exploitation (crash or resource exhaustion).
NVD Description
Improper Input Validation (CWE-20) in the internal Content Connectors search endpoint in Kibana can lead Denial of Service via Input Data Manipulation (CAPEC-153)
Deeper analysisAI
CVE-2026-26935 is an improper input validation vulnerability (CWE-20) affecting the internal Content Connectors search endpoint in Kibana. Published on 2026-02-26, it enables a denial of service condition through input data manipulation (CAPEC-153). The issue carries a CVSS v3.1 base score of 6.5 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
A remote attacker with low privileges can exploit this vulnerability over the network with low attack complexity and no user interaction. Exploitation leads to a denial of service, significantly impacting availability without affecting confidentiality or integrity.
Elastic Security Advisory ESA-2026-13 addresses this issue, with details available at https://discuss.elastic.co/t/kibana-8-19-12-9-2-6-9-3-1-security-update-esa-2026-13/385249. Practitioners should consult the advisory for affected Kibana versions and recommended patches.
Details
- CWE(s)