How severe is CVE-2026-26135?

CVE-2026-26135 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-26135 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-26135?

CVE-2026-26135 affects Microsoft Azure Custom Locations Resource Provider. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-26135?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-26135 have an EU (EUVD) identifier?

Yes. CVE-2026-26135 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18556.

When was CVE-2026-26135 published?

CVE-2026-26135 was published on 2026-04-03 and last updated on 2026-06-17.

CVE-2026-26135

CVE-2026-26135 is a critical-severity vulnerability in Microsoft Azure Custom Locations Resource Provider with a CVSS 3.x base score of 9.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18556
Weakness: CWE-918
Affected product: Microsoft Azure Custom Locations Resource Provider
Published: 2026-04-03
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2026-26135?: Server-side request forgery (ssrf) in Azure Custom Locations Resource Provider (RP) allows an authorized attacker to elevate privileges over a network.
How severe is CVE-2026-26135?: CVE-2026-26135 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-26135 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-26135?: CVE-2026-26135 affects Microsoft Azure Custom Locations Resource Provider. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-26135?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-26135 have an EU (EUVD) identifier?: Yes. CVE-2026-26135 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18556.
When was CVE-2026-26135 published?: CVE-2026-26135 was published on 2026-04-03 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26135

Affected products (1)

cpe:2.3:a:microsoft:azure_custom_locations_resource_provider:-:*:*:*:*:*:*:*

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