Local file disclosure via REST API XXE
Published Aug 12, 2021 · Updated Aug 10, 2026
XML external entity injection in Microsoft Azure CycleCloud before 8.2.0 allows local users to read limited data through the REST API. The REST API's XML parser resolves attacker-controlled external entity references instead of rejecting them. Exploitation requires local access to the application server, and Microsoft's published assessment limits the consequence to confidentiality loss.
Summary
What happened
XML external entity injection in Microsoft Azure CycleCloud before 8.2.0 allows local users to read limited data through the REST API. The REST API's XML parser resolves attacker-controlled external entity references instead of rejecting them. Exploitation requires local access to the application server, and Microsoft's published assessment limits the consequence to confidentiality loss.
The record
- CVE
- CVE-2021-36943
- Published
- Aug 12, 2021
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Azure CycleCloud
- Classifications
- CWE-269, T1005
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 12, 2021CVE publishedPublication date reported by the CVE source.
- Aug 10, 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.
- Affected versionversion=8.2.0 <8.2.0
What conditions does exploitation require?
What is affected?
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.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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