CVE-2026-86206Public exploitNetwork attack vector

Unauthenticated internal API access via inconsistent request parsing

Published Sep 5, 2026 · Updated Sep 8, 2026

Access control bypass in N-able N-central before 2026.3.1.13 allows remote attackers to access internal APIs via crafted HTTP requests. Envoy treats a semicolon-bearing path as unprotected, while Jetty normalizes that path and a malformed Forwarded value to a loopback request before the access filter evaluates it. No credentials or user interaction are required; the flaw alone reaches local-only SOAP operations and yields a pre-login session, while privileged account creation requires chaining a separate authentication bypass.

CVSS severity6.9
Medium
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Access control bypass in N-able N-central before 2026.3.1.13 allows remote attackers to access internal APIs via crafted HTTP requests. Envoy treats a semicolon-bearing path as unprotected, while Jetty normalizes that path and a malformed Forwarded value to a loopback request before the access filter evaluates it. No credentials or user interaction are required; the flaw alone reaches local-only SOAP operations and yields a pre-login session, while privileged account creation requires chaining a separate authentication bypass.

The record

CVE
CVE-2026-86206
Published
Sep 5, 2026
Updated
Sep 8, 2026
Vendor
N-able
Product
N-central
Classifications
CWE-791, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2026.3.1.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

N-able · N-centralversion=0 <2026.3.1.13

Published CVSS scores

6.9N-able CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-791Incomplete Filtering of Special Elements
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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