CVE-2026-42398
📛 CVE Title
Elastic Kibana: CVE-2026-42398: Server-Side Request Forgery (SSRF)
Description
Server-Side Request Forgery (CWE-918) in Kibana allows authenticated users with connector management privileges to bypass the operator-configured connection allowlist. By configuring a Webhook connector with a crafted target, an attacker can cause Kibana to issue outbound requests to destinations that the egress restriction controls were intended to block.
Overview
- State
- —
- Assigner (CNA)
- —
- CVSS severity
- MEDIUM
- CVSS score
- 5.0 / 10
- CVSS vector
AV:N/AC:L/Au:S/C:C/I:N/A:N- Effective score
- 5.0 / 10 MEDIUM source: CNA overview
- CWE(s)
- —
- Reserved
- —
- Published
- 2026-05-28 00:00 UTC
- Last updated
- —
- Source
- https://www.rapid7.com/db/vulnerabilities/elastic-kibana-cve-2026-42398/
- Linked Threat
- CVE-2026-42398 — CVE-2026-42398
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-05-28 21:16:30 UTC
- NVD last modified
- 2026-06-17 10:47:47 UTC
- NVD CVSS v3.1
- 7.7 / 10 HIGH source: security@elastic.co
- NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N- Exploitability subscore
- 3.1 / 10
- Impact subscore
- 4.0 / 10
- EPSS score
- 0.0030 (probability of exploitation in next 30 days)
- EPSS percentile
- 22.17% vs all CVEs — higher = more likely to be exploited, as of 2026-07-27
NVD-assigned CWE(s):
CWE-918
(differs from the CNA list above)
NVD / KEV / EPSS data refreshed 2026-07-28 14:03 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-33032 - Assigner
- elastic
- Published
- May 28, 2026, 7:47:53 PM
- Updated
- May 29, 2026, 4:47:26 PM
- EUVD base score (CVSS 3.1)
-
7.7 / 10
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N - EUVD-reported EPSS
- 0.3000
- Vendors
- Elastic
- Products
-
Kibana (9.3.0 ≤9.3.1)Kibana (9.0.0 ≤9.2.7)
- Aliases
-
GHSA-43ww-gwmw-f89v
ENISA description: Server-Side Request Forgery (CWE-918) in Kibana allows authenticated users with connector management privileges to bypass the operator-configured connection allowlist. By configuring a Webhook connector with a crafted target, an attacker can cause Kibana to issue outbound requests to destinations that the egress restriction controls were intended to block.
Affected products — CPE 2.3 (1) NVD
NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.
cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*
Vendor references (0)
References embedded in the original CVE record by the assigning CNA.
None in the CVE record.
Web references (7)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- https://nvd.nist.gov/vuln/detail/CVE-2026-42398 tenable:nvd.nist.gov
- https://www.first.org/epss/ tenable:www.first.org
- https://discuss.elastic.co/t/kibana-9-2-8-and-9-3-2-security-update-esa-2026-37/386557 rapid7:discuss.elastic.co
- http://cwe.mitre.org/data/definitions/918.html rapid7:cwe.mitre.org
- https://www.cve.org/CVERecord?id=CVE-2026-42398 rapid7:www.cve.org
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-33032 rapid7:euvd.enisa.europa.eu
- https://attackerkb.com/topics/CVE-2026-42398 rapid7:attackerkb.com
NVD-tagged references (1)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://discuss.elastic.co/t/kibana-9-2-8-and-9-3-2-security-update-esa-2026-37/386557 security@elastic.co Vendor Advisory
Remediations (11)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
rapid7
elastic-kibana-upgrade-latest
2026-06-04 08:57 UTC -
web:cybersecuritynews.com
Microsoft has officially acknowledged a critical zero-day vulnerability in Microsoft Defender, publicly dubbed "RoguePlanet," and confirmed it is actively developing a security patch to address the flaw.
2026-06-19 02:28 UTC -
web:cybersecuritynews.com
Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.
2026-06-19 02:28 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-06-19 02:28 UTC -
web:www.crowdstrike.com
Microsoft has released security updates for 130 vulnerabilities, including 30 critical, in its May 2026 Patch Tuesday rollout.
2026-06-19 02:28 UTC -
web:www.linkedin.com
Microsoft has confirmed that it is developing a security update to address a newly disclosed zero-day vulnerability in Microsoft Defender, following the public release of exploit code that ...
2026-06-19 02:28 UTC -
web:www.malwarebytes.com
Microsoft says it's working on a fix for an unpatched Defender vulnerability that can give attackers the highest level of access on Windows.
2026-06-19 02:28 UTC -
web:www.microsoft.com
Security Update Guide Notifications Microsoft's free Security Update Guide Notifications provide links to security-related software updates and notification of re-released security updates. These notifications are sent via email throughout the month as needed.
2026-06-19 02:28 UTC -
web:www.oracle.com
This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.
2026-06-19 02:28 UTC -
web:www.oracle.com
This Critical Security Patch Update contains 35 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Security Patch Update and other Oracle Software Security Assurance activities is located at May 2026 Critical Security Patch Update: Executive Summary and Analysis.
2026-06-19 02:28 UTC -
web:zecurit.com
Get the complete breakdown of Microsoft's June 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .
2026-06-19 02:28 UTC
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