Security readout for executives and security teams
Plain-English summary
CVE-2026-26937 is a Kibana Timelion denial-of-service issue. A low-privileged authenticated user could manipulate input in a way that exhausts resources, reducing Kibana availability. It does not indicate data theft or data modification. Business urgency is moderate where Kibana is user-accessible or operationally critical.
Executive priority
Prioritize remediation for internet-facing, broadly accessible, or mission-critical Kibana environments. For tightly restricted internal deployments, handle through normal security patching, while monitoring availability risk.
Technical view
The CVE describes CWE-400 uncontrolled resource consumption in Kibana’s Timelion component, with CVSS 6.5: network-accessible, low complexity, low privileges required, no user interaction, and high availability impact. The provided affected data names Elastic Kibana 8.0.0 and 9.0.0, with other versions marked default unaffected, but exact version-range detail is limited.
Likely exposure
Exposure is most relevant to organizations running Kibana with Timelion enabled or accessible to authenticated users. Risk increases if many low-privileged users can access Kibana or if Kibana supports critical monitoring, alerting, or incident response workflows.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. The issue requires authenticated low-privilege access and involves input manipulation that can cause resource exhaustion. No exploit code or public exploitation details are provided in the supplied sources.
Researcher notes
The provided data is sparse. The CVSS vector indicates authenticated network exploitation with availability-only impact. Affected-version detail appears limited to listed Kibana versions plus Elastic advisory context. Validate final version scope and fixed releases directly against Elastic’s ESA-2026-15 advisory.
Mitigation direction
- Review Elastic advisory ESA-2026-15 for exact affected and fixed versions.
- Plan upgrade to Elastic’s referenced Kibana security releases where applicable.
- Restrict Kibana access to trusted authenticated users only.
- Limit Timelion access if not required, following Elastic guidance.
- Monitor Kibana resource usage and availability until remediation is complete.
Validation and detection
- Inventory Kibana deployments and record exact versions.
- Check whether Timelion is enabled or accessible.
- Confirm Kibana access requires authentication and least privilege.
- Compare deployed versions against Elastic advisory ESA-2026-15.
- Review logs and metrics for abnormal Kibana resource exhaustion.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-400: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-26937 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.