CVE-2026-78607: Missing Authorization in Elasticsearch Leading to Information Disclosure

mediumCVSS 5.4CVE-2026-78607

CSIRTS triage

vendor: Elastic product: Elasticsearch Information disclosure

What: Missing authorization check allows unauthenticated information disclosure through Elasticsearch endpoints.
Who is affected: Elasticsearch deployments exposed to untrusted networks without proper network segmentation.
Urgency: Medium urgency with CVSS 5.4; information disclosure without authentication is exploitable but does not directly enable code execution.
Action: Update Elasticsearch to a patched version and restrict network access to trusted hosts.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.4
Published: 2026-09-02
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78607

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-786070.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-78607	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[NEW] [high] Elasticsearch: Multiple Vulnerabilitiescert-bund
unknownMultiple vulnerabilities in Elastic products (02 September 2026)cert-fr-avis
mediumCVE-2026-78607: Missing Authorization (CWE-862) in the Elasticsearch custom inference service can lead to info…nvd

Recent advisories for Missing Authorization in

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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