Raw vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:NSummary
CVE-2026-33458 is a medium-severity SSRF (CWE-918) vulnerability in Elastic Kibana. Its CVSS base score is 6.3 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 13th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to AC-4 (Information Flow Enforcement) and SI-10 (Information Input Validation) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2026-33458 is a Server-Side Request Forgery vulnerability (CWE-918) in Kibana One Workflow, specifically within the Workflows Execution Engine. This flaw enables bypassing host allowlist restrictions, potentially leading to information disclosure of sensitive internal endpoints and data. The vulnerability was published on 2026-04-08T18:26:00.267 and carries a CVSS v3.1 base score of 6.3 (AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N).
An authenticated attacker with low privileges, specifically workflow creation and execution permissions, can exploit this vulnerability over the network. Exploitation requires high attack complexity but has no user interaction and changes scope, allowing the attacker to achieve high-impact confidentiality violations by accessing restricted internal resources.
The Elastic Security Advisory ESA-2026-28, detailed at https://discuss.elastic.co/t/kibana-9-3-3-security-update-esa-2026-28/385815, provides mitigation through the Kibana 9.3.3 security update.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-20519
Vulnerability Data
Server-Side Request Forgery (CWE-918) in Kibana One Workflow can lead to information disclosure. An authenticated user with workflow creation and execution privileges can bypass host allowlist restrictions in the Workflows Execution Engine, potentially exposing sensitive internal endpoints and data.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
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V1.3.6V1.5.3V5.3.2V10.4.7
Mitigating Controls (NIST 800-53 r5) AI
Information flow enforcement can restrict which destinations the server is allowed to contact on behalf of users.
Input validation directly stops untrusted URLs from being accepted and fetched without destination checks.
Boundary protection limits the network reach of server-initiated requests even if SSRF occurs.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Secure development practices directly include input validation and destination allow-listing that prevent SSRF.
Runtime monitoring of web applications and services can detect anomalous outbound requests indicative of SSRF.
Vulnerability identification processes can discover and record SSRF flaws in web applications.
Network segmentation and egress controls can limit the damage from successful SSRF requests.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Operational threat data describing SSRF campaigns can be used to tighten outbound-request allow-lists and detection rules before attackers exploit them.