EUVD-2026-17608
GHSA-hpm8-9qx6-jvwv
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionGitHub Advisory
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.71 and 9.7.1-alpha.1, file downloads via HTTP Range requests bypass the afterFind(Parse.File) trigger and its validators on storage adapters that support streaming (e.g. the default GridFS adapter). This allows access to files that should be protected by afterFind trigger authorization logic or built-in validators such as requireUser. This issue has been patched in versions 8.6.71 and 9.7.1-alpha.1.
AnalysisAI
Parse Server versions prior to 8.6.71 and 9.7.1-alpha.1 allow HTTP Range requests to bypass the afterFind trigger and its validators when downloading files from streaming-capable storage adapters like GridFS, enabling unauthorized access to protected files that should be restricted by authentication or authorization logic. This authentication bypass affects all deployments using affected versions with file protection policies enforced via afterFind triggers.
Technical ContextAI
Parse Server is a Node.js-based backend framework that uses storage adapters (such as GridFS for MongoDB) to manage file objects. The afterFind trigger is a critical hook that runs after file retrieval and is commonly used to enforce authorization policies, validate access permissions, and apply requireUser constraints before returning file data. HTTP Range requests, which request specific byte ranges of a file (typically used for resumable downloads, video streaming, and partial content delivery), were processed by streaming adapters in a code path that bypassed the standard afterFind trigger execution. The vulnerability stems from CWE-285 (Improper Authorization) where the streaming download handler failed to invoke the same authorization validation chain used for standard (non-Range) file downloads. This creates a logical flaw where Range-based requests circumvent access control mechanisms that would otherwise protect sensitive files.
RemediationAI
Upgrade Parse Server to version 8.6.71 or later (for 8.x branch) or 9.7.1-alpha.1 or later (for 9.x branch). Vendor-released patches are available via https://github.com/parse-community/parse-server/pull/10361 and https://github.com/parse-community/parse-server/pull/10362, with commits 053109b3ee71815bc39ed84116c108ff9edbf337 and a0b0c69fc44f87f80d793d257344e7dcbf676e22 implementing the fix. As an interim mitigation pending upgrade, restrict HTTP Range request processing at the reverse proxy or load balancer level (e.g., disable Range header forwarding to Parse Server), though this may impact legitimate streaming clients. Verify that file protection policies are implemented via afterFind triggers and audit file access logs to detect any prior unauthorized Range-based downloads.
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Same weakness CWE-285 – Improper Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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