High

SSRF Elevation of Privilege in Azure Custom Locations Resource Provider

IdentifiersCVE-2026-26135CWE-918· Server-Side Request Forgery (SSRF)

CVE-2026-26135 is a server-side request forgery (SSRF) vulnerability in the Azure Custom Locations Resource Provider (RP). According to the provided Microsoft and CVE context, an authorized attacker can exploit the flaw over the network to cause the service to make unintended server-side requests, resulting in elevation of privilege. The issue is classified as CWE-918. The available information does not identify a specific vulnerable function, endpoint, or request-processing component within the RP.

For your environment

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an authorized attacker with low privileges to elevate privileges over the network. The provided CVSS v3.1 vector (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N) indicates low attack complexity, no user interaction, changed scope, high confidentiality impact, and high integrity impact, with no availability impact.

Mitigation

If you can’t patch tonight, do this now.

No customer mitigation is required based on the provided advisory. Microsoft states the issue has already been fully mitigated by the service provider side.

Remediation

Patch, then assume compromise.

No customer remediation is required based on the provided advisory. Microsoft states that the vulnerability in the Azure service has already been officially fixed on the provider side.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

Microsoft CorporationAzure Custom Locations Resource Providerapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

11 SOURCESView more in app

cvefeed high severityNews

Apr 3, 2026

CVE-2026-26135 - Azure Custom Locations Resource Provider (RP) Elevation of Privilege Vulnerability

A server-side request forgery vulnerability in Azure Custom Locations Resource Provider (RP) that allows an authorized attacker to elevate privileges over a network.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity10