Improper Input Validation in Kibana Email Connector Leading to Excessive Allocation
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Deferred Red Hat: fix deferred
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-770.
Summary
Improper Input Validation (CWE-20) in Kibana's Email Connector can allow an attacker to cause an Excessive Allocation (CAPEC-130) through a specially crafted email address parameter. This requires an attacker to have authenticated access with view-level privileges sufficient to execute connector actions. The application attempts to process specially crafted email format, resulting in complete service unavailability for all users until manual restart is performed.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Elastic | Kibana | 8.0.0 – 8.19.9; 7.0.0 – 7.17.29; 9.0.0 – 9.1.9; 9.2.0 – 9.2.3 | — | No fix listed | CNA |
- Kibana VendorElastic Affected 8.0.0 – 8.19.9; 7.0.0 – 7.17.29; 9.0.0 – 9.1.9; 9.2.0 – 9.2.3 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:* | 7.0.0 – 7.17.29; 8.0.0 to before 8.19.0; 9.0.0 to before 9.1.10; 9.2.0 to before 9.2.4 | Vulnerable | Elastic |
- cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:* Versions 7.0.0 – 7.17.29; 8.0.0 to before 8.19.0; 9.0.0 to before 9.1.10; 9.2.0 to before 9.2.4 Vulnerable ·Elastic
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Logging Subsystem for Red Hat OpenShift | Affected | No fix yet: Fix deferred |
| Red Hat JBoss Enterprise Application Platform 8 | Affected | No fix yet: Fix deferred |
| Red Hat JBoss Enterprise Application Platform Expansion Pack | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift distributed tracing 3 | Affected | No fix yet: Fix deferred |
| Red Hat OpenStack Platform 16.2 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-0543
- 2026-10-03 Alias added: GHSA-p2g6-3qpg-4v6h
References
More Elastic Kibana vulnerabilities
- TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
- TI-2018-12328 Kibana versions before 6.4.3 and 5.6.13 contain an arbitrary file inclusion flaw in the… CVSS 3.0CRITICAL 9.8
- TI-2025-18692 Kibana arbitrary code execution via prototype pollution CVSS 3.1CRITICAL 9.8
- TI-2020-05660 Code injection in Elastic Kibana CVSS 3.1HIGH 8.8
- TI-2024-24803 Deserialization of untrusted data in Elastic Kibana CVSS 3.1CRITICAL 9.9
- TI-2024-24800 Kibana arbitrary code execution via YAML deserialization CVSS 3.1CRITICAL 9.1
Sources
- CVE-2026-0543 · CVE Program
- CVE-2026-0543 · NVD
- FIRST EPSS
- GHSA-p2g6-3qpg-4v6h · GitHub Advisory Database · CC BY 4.0
- CVE-2026-0543 · Red Hat security data · CC BY 4.0
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