CVE-2021-37705

OneFuzz is an open source self-hosted Fuzzing-As-A-Service platform. Starting with OneFuzz 2.12.0 or greater, an incomplete authorization check allows an authenticated user from any Azure Active Directory tenant to make authorized API calls to a vulnerable OneFuzz instance. To be vulnerable, a OneFuzz deployment must be both version 2.12.0 or greater and deployed with the non-default --multi_tenant_domain option. This can result in read/write access to private data such as software vulnerability and crash information, security testing tools and proprietary code and symbols. Via authorized API calls, this also enables tampering with existing data and unauthorized code execution on Azure compute resources. This issue is resolved starting in release 2.31.0, via the addition of application-level check of the bearer token's `issuer` against an administrator-configured allowlist. As a workaround users can restrict access to the tenant of a deployed OneFuzz instance < 2.31.0 by redeploying in the default configuration, which omits the `--multi_tenant_domain` option.

• CWE-285
• CWE-346
• CWE-863

• https://github.com/microsoft/onefuzz/commit/2fcb4998887959b4fa11894a068d689189742cb1Patch, Third Party Advisory
• https://github.com/microsoft/onefuzz/pull/1153Patch, Third Party Advisory
• https://github.com/microsoft/onefuzz/releases/tag/2.31.0Release Notes, Third Party Advisory
• https://github.com/microsoft/onefuzz/security/advisories/GHSA-q5vh-6whw-x745Third Party Advisory
• https://pypi.org/project/onefuzz/Product
• https://github.com/microsoft/onefuzz/commit/2fcb4998887959b4fa11894a068d689189742cb1Patch, Third Party Advisory
• https://github.com/microsoft/onefuzz/pull/1153Patch, Third Party Advisory
• https://github.com/microsoft/onefuzz/releases/tag/2.31.0Release Notes, Third Party Advisory
• https://github.com/microsoft/onefuzz/security/advisories/GHSA-q5vh-6whw-x745Third Party Advisory
• https://pypi.org/project/onefuzz/Product

Published

Aug 13, 2021

Last Modified

Jun 17, 2026

Status

Modified

• Uncovering a hidden BOLA in Appsmith's snapshot logicStrix autonomously discovered a BOLA/IDOR vulnerability in Appsmith's snapshot deletion path.
• Same Subject, Wrong User: A Cross-Issuer Account Takeover in n8nStrix found an identity-binding bug in n8n's token-exchange flow enabling account takeover.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

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