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CVAT EUVDEUVD-2026-56856

| CVE-2026-73221 MEDIUM
Incorrect Authorization (CWE-863)
2026-08-11 GitHub_M
Authentication Bypass Cvat
5.3
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/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
vuln.today AI
5.4 MEDIUM

Network-accessible requiring only low-privilege Worker account; confidentiality limited to request metadata and integrity limited to canceling jobs, no availability impact.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 11, 2026 - 23:00 vuln.today
Analysis Generated
Aug 11, 2026 - 23:00 vuln.today
Patch available
Aug 11, 2026 - 19:04 EUVD

DescriptionCVE.org

CVAT is an open source interactive video and image annotation tool for computer vision. From 2.17.0 until 2.72.0, a user with the Worker role can use predictable task-based request IDs with the lambda request retrieve and destroy endpoints to view automatic annotation requests for tasks or jobs the user cannot access and cancel requests initiated by other users. This issue is fixed in version 2.72.0.

AnalysisAI

Broken object-level authorization in CVAT's lambda annotation API allows authenticated Worker-role users to exploit predictable task-based request IDs to read automatic annotation requests for tasks they are not permitted to access and to cancel annotation requests submitted by other users. All CVAT deployments running versions 2.17.0 through 2.71.x are affected per cpe:2.3:a:cvat-ai:cvat. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate with Worker-role account
Delivery
Observe own task IDs to infer request ID pattern
Exploit
Enumerate predictable lambda request IDs for out-of-scope tasks
Execution
Call retrieve endpoint to read unauthorized annotation request metadata
Persist
Call destroy endpoint with enumerated IDs
Impact
Cancel other users' automatic annotation jobs
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Vulnerability AssessmentAI

Exploitation Exploitation requires an active CVAT account with at minimum the Worker role - unauthenticated access is not possible, as the CVSS 4.0 PR:L metric confirms. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 5.3 (Medium) accurately represents the constrained blast radius: exploitation requires a valid Worker-role credential (PR:L), the confidentiality exposure is limited to lambda request metadata rather than annotation content (VC:L), and the integrity impact is limited to canceling others' annotation jobs (VI:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated CVAT user with the Worker role constructs or enumerates predictable task-based lambda request IDs - derived from task identifiers the Worker can observe from their own tasks - and issues GET requests to the lambda retrieve endpoint for IDs corresponding to tasks they have no legitimate access to, obtaining annotation request metadata. The attacker then issues DELETE requests to the destroy endpoint using those IDs to cancel in-flight automatic annotation jobs belonging to other teams, disrupting their annotation pipelines. …
Remediation Upgrade CVAT to version 2.72.0 or later, which resolves the authorization flaw as confirmed by the vendor release at https://github.com/cvat-ai/cvat/releases/tag/v2.72.0 and security advisory GHSA-m7p7-6w4m-886p. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-56856 vulnerability details – vuln.today
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