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CVE-2026-58253: NATS Server: Route API Auth Bypass

highCVSS 8.8CVE-2026-58253

CSIRTS triage

vendor: NATSproduct: NATS ServerAuthentication bypass
What
A route API authentication bypass vulnerability exists.
Who is affected
Deployments of NATS Server are affected.
Urgency
Remediation is urgent due to the high severity and potential for unauthorized access.
Action
Update to the latest version of NATS Server.

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
high — CVSS 8.8
Published
2026-07-02
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58253

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-58253coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for NATS Server

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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