Apache DolphinScheduler Task Definition Authorization Bypass

An authorization bypass vulnerability in Apache DolphinScheduler allows authenticated users to modify task definitions in projects they are not authorized to access through the /dolphinscheduler/projects/{projectCode}/task-definition/{code}/with-upstream endpoint. The endpoint fails to verify that the task definition identified by code belongs to the project specified by projectCode. An authenticated user can supply the code of a project they are authorized to access together with a task definition code from another project, bypassing project access restrictions and modifying the target task definition and its upstream dependencies. This vulnerability can compromise workflow integrity and disrupt task execution in unauthorized projects.This issue affects Apache DolphinScheduler: before 3.4.3. Users are recommended to upgrade to version 3.4.3, which fixes the issue.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

Apache DolphinScheduler contains an authorization bypass vulnerability (CVE-2026-66084, CVSS 8.1) affecting the /dolphinscheduler/projects/{projectCode}/task-definition/{code}/with-upstream endpoint. The flaw allows authenticated users to modify task definitions in projects they lack authorization to access by exploiting insufficient validation—the endpoint fails to verify that a task definition actually belongs to the specified project. This enables privilege escalation and unauthorized modification of critical workflow configurations, potentially affecting any organization running vulnerable versions of DolphinScheduler as a workflow orchestration platform.

Casky's 283 mapped skills leverage Claude's extended reasoning to detect the attack patterns underlying this vulnerability across MITRE ATT&CK's Privilege Escalation (TA0004) and Credential Access (TA0006) techniques. Practitioners using Casky would identify suspicious indicators including: requests to task-definition endpoints with mismatched projectCode/code parameters, successful modifications to tasks outside a user's authorized scope, API responses indicating cross-project resource access, and authentication logs showing authenticated users accessing resources beyond their privilege level. The platform's skill mapping enables detection of the authorization logic flaws (CWE-863: Improper Authorization) by analyzing request patterns that bypass intended access controls, allowing security teams to identify exploitation attempts before task definitions are maliciously altered in production workflows.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-66084.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

identity access management · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

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