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CVE-2026-82561— Apache NiFi: Missing Authorization for Components Referenced in Flow Update Methods

Quick assessment

Affected
Apache Software Foundation Apache NiFi
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache NiFi 1.5.0 through 2.11.0 provide REST API methods that replace the entire contents of a Process Group using a client-supplied flow definition, covering Process Group flow replacement together with versioned flow update and rebase operations. Framework

CVSS 5.9 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apache Software Foundation Apache NiFi 1.5.0≤ 2.11.0 affected
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I. Basic Information for CVE-2026-82561

Vulnerability Information

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Vulnerability Title
Apache NiFi: Missing Authorization for Components Referenced in Flow Update Methods
Source: CVE Program / CVE List V5
Vulnerability Description
Apache NiFi 1.5.0 through 2.11.0 provide REST API methods that replace the entire contents of a Process Group using a client-supplied flow definition, covering Process Group flow replacement together with versioned flow update and rebase operations. Framework authorization for these methods was limited to read and write privileges on the Process Group itself, unlike the corresponding asynchronous update request methods, which also authorize the components encapsulated in the Process Group along with referenced Controller Services, Parameter Contexts, and Parameter Providers. As a result of the missing authorization, an authenticated user with write access to a Process Group could supply a flow definition that modifies or removes components in descendant Process Groups protected by more restrictive access policies, and could bind components to Controller Services and Parameter Contexts without authorization for those referenced components. Existing verification checks limited the impact to stopped components, and the issue applies only to deployments that use component-level authorization policies, because the framework enforces write permissions as the security boundary. Upgrading to Apache NiFi 2.12.0 is the recommended mitigation, which applies consistent reference resolution and component authorization across Process Group replacement and versioned flow update methods
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:H/VA:L/SC:L/SI:L/SA:L/S:N/AU:Y/R:U/V:C/RE:L/U:Clear
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache NiFi 1.5.0 ~ 2.11.0 -

II. Public POCs for CVE-2026-82561

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III. Intelligence Information for CVE-2026-82561

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Mailing List Discussions for CVE-2026-82561 (1)

Same Patch Batch · Apache Software Foundation · 2026-09-16 · 20 CVEs total

CVE-2026-87976 7.2 HIGH Apache NiFi Registry: Improper Limitation of Pathname in Persisted Extension Bundles
CVE-2026-86089 2.3 LOW Apache NiFi: Missing Process Group Authorization for Connector Migration
CVE-2026-81866 0.5 LOW Apache NiFi: Missing Authorization for Assets and Secrets Referenced by Connector Configur
CVE-2026-86465 Apache Airflow Akeyless provider: Akeyless secrets backend: team-scope guard bypass via us
CVE-2026-70469 Apache NiFi: Improper Handling of Case Sensitivity for Content-Encoding in HTTP Requests
CVE-2026-82311 Apache Airflow FAB provider: FAB password reset never invalidates sessions: string/int _us
CVE-2026-86462 Apache Airflow FAB provider: FAB Admin password PATCH does not invalidate database-backed
CVE-2026-86792 Apache Airflow Apache Kafka provider: Connection-editor remote code execution on the Sched
CVE-2026-82310 Apache Airflow FAB provider: FAB auth manager: deactivated users retain and renew Core API
CVE-2026-76186 Apache Airflow Keycloak provider: Keycloak token cookies not bound to Airflow session iden
CVE-2026-76187 Apache Airflow Keycloak provider: Any realm client's credentials mint an Airflow session J
CVE-2026-86466 Apache Airflow FAB provider: FAB Authentik provider: id_token issuer/audience not validate
CVE-2026-59739 Apache ZooKeeper: Information disclosure via SetWatches reconnect replay
CVE-2026-59969 Apache ZooKeeper: Improper validation of certificate with host mismatch in FIPS mode
CVE-2026-79993 Apache ZooKeeper: Missing ACL check on deleteContainer opcode allows unauthorized deletion
CVE-2026-84439 Apache ZooKeeper: Audit log injection via unsanitized output from multiple sources
CVE-2026-84501 Apache ZooKeeper: Operational log forgery via newline injection in EnsembleAuthenticationP
CVE-2026-68536 Apache MyFaces: Server-Side Request Forgery / Local File Inclusion Vulnerability
CVE-2026-76646 Apache MyFaces: Denial of Service via Unbounded Request Parsing

IV. Related Vulnerabilities

Same product: Apache NiFi
Same vendor: Apache Software Foundation
Same weakness: CWE-862

V. Comments for CVE-2026-82561

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