Security readout for executives and security teams
Plain-English summary
CVE-2026-26935 is a Kibana denial-of-service issue. A logged-in attacker could manipulate input to an internal Content Connectors search endpoint and disrupt Kibana availability. The published CVSS score is 6.5, so this is operationally important but not a data-theft or system-takeover finding based on current sources.
Executive priority
Treat this as a medium-priority availability risk. Prioritize internet-accessible or broadly user-accessible Kibana deployments, especially where business operations depend on Kibana dashboards, search, or monitoring workflows.
Technical view
The CVE describes improper input validation (CWE-20) in Kibana’s internal Content Connectors search endpoint. CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H, indicating network reachability, low complexity, required privileges, no user interaction, and high availability impact only.
Likely exposure
Exposure is most relevant where Kibana is deployed and authenticated users can reach the internal Content Connectors search functionality. The source bundle lists Elastic Kibana versions 8.4.0, 9.0.0, and 9.3.0 as affected, with default status otherwise unaffected.
Exploitation context
No CISA KEV listing is provided, and the source bundle does not cite active exploitation. The vulnerability requires some level of Kibana privilege and is aimed at service disruption rather than confidentiality or integrity compromise.
Researcher notes
The public record is brief and does not include proof-of-concept details. Avoid assuming broader Elastic Stack impact beyond Kibana. Validate against the CVE record and Elastic advisory because the affected-version data in the provided bundle is narrow.
Mitigation direction
- Review Elastic ESA-2026-13 for the vendor-approved remediation path.
- Prioritize Kibana updates where listed affected versions are deployed.
- Restrict Kibana access to trusted authenticated users where feasible.
- Monitor Kibana availability and error rates until remediation is complete.
Validation and detection
- Inventory Kibana instances and record exact versions.
- Check whether Content Connectors functionality is enabled or exposed to users.
- Confirm whether deployed versions match the affected versions listed in the CVE data.
- Verify remediation status against Elastic ESA-2026-13.
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-20: 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-2026-26935 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.