Security readout for executives and security teams
Plain-English summary
A flaw in Microsoft Azure Custom Locations could let someone who already has authorized access abuse the service to gain higher privileges remotely. Successful exploitation could expose or alter sensitive resources. The supplied sources rate it critical, but they do not identify affected versions, indicators of compromise, or confirmed attacks.
Executive priority
Treat as an urgent exposure-verification and remediation task because privilege escalation could compromise sensitive Azure resources. Prioritize environments using Custom Locations and review authorized identities immediately. Do not claim compromise solely from product presence; the supplied evidence contains no confirmed exploitation or detection indicators.
Technical view
CVE-2026-26135 is a server-side request forgery vulnerability in Azure Custom Locations Resource Provider. Its CVSS 3.1 score is 9.6: network-accessible, low complexity, low privileges required, no user interaction, changed scope, and high confidentiality and integrity impact. The vector indicates no availability impact.
Likely exposure
Potential exposure is limited to environments using Azure Custom Locations Resource Provider where an attacker can obtain the required authorized, low-privilege access. The supplied record provides no affected-version boundaries or deployment criteria, so organizations must confirm applicability through Microsoft guidance and their Azure inventory.
Exploitation context
The supplied bundle does not identify this CVE as present in KEV and cites no evidence of active exploitation or public exploit availability. Exploitation still requires an authorized attacker, but the low complexity, remote reach, and absence of user interaction increase risk where applicable access exists.
Researcher notes
CWE-918 and the changed-scope vector support an SSRF-based trust-boundary crossing with privilege escalation. Version data is unspecified, and the supplied text does not describe the vulnerable request path, privilege gained, attack prerequisites beyond authorization, detection artifacts, or exact remediation. Avoid inferring affected configurations or exploitability beyond the published vector.
Mitigation direction
- Review Microsoft’s advisory and apply its specified remediation without delay.
- Confirm whether remediation is Microsoft-managed or requires customer action.
- Reduce unnecessary authorization to the affected resource provider while remediation is verified.
- Monitor Microsoft guidance for revised affected-version or mitigation details.
Validation and detection
- Inventory environments using Azure Custom Locations Resource Provider.
- Identify identities authorized to interact with the affected provider and review their necessity.
- Verify the Microsoft-prescribed remediation is applied or confirmed service-side.
- Review relevant Azure logs for unusual activity; supplied sources provide no specific indicators.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-918: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCloud metadata behavior lookup
The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-26135 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C3.15.8microsoftVulnerability scoring details
Base CVSS 3.1 score
9.6CriticalVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Azure Custom Locations Resource Provider (RP) Elevation of Privilege VulnerabilityCVE reference, microsoft · vendor-advisory, patch
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.