CVE-2026-26135Network attack vector

Authenticated privilege escalation via server-side request forgery

Published Apr 2, 2026 · Updated Apr 2, 2026

SSRF in Microsoft Azure Custom Locations Resource Provider allows remote authenticated users to elevate privileges through network requests. Microsoft has not disclosed the request field, destination-validation failure, or backend endpoint involved. A low-privileged Azure identity can cross a security boundary and obtain elevated access; availability is not affected.

CVSS severity9.6
Critical
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Microsoft Azure Custom Locations Resource Provider allows remote authenticated users to elevate privileges through network requests. Microsoft has not disclosed the request field, destination-validation failure, or backend endpoint involved. A low-privileged Azure identity can cross a security boundary and obtain elevated access; availability is not affected.

The record

CVE
CVE-2026-26135
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
Microsoft
Product
Azure Custom Locations
Classifications
CWE-918, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 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=-

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Azure Custom Locationsversion=-

Published CVSS scores

9.6MicrosoftCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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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