Azkaban through 4.0.0 Authorization Bypass via ScheduleServlet

Advisories

Azkaban through 4.0.0 Authorization Bypass via ScheduleServlet

severity: high
date: 9/18/2026
Affecting: azkaban <= 4.0.0
CVE: CVE-2026-93737
CWE: CWE-862 Missing Authorization
CVSS: 7.1
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
References: GitHub Issue #3348
https://github.com/azkaban/azkaban
https://github.com/azkaban/azkaban/blob/4.0.0/azkaban-web-server/src/main/java/azkaban/webapp/servlet/ScheduleServlet.java#L237-L262
https://github.com/azkaban/azkaban/blob/4.0.0/azkaban-web-server/src/main/java/azkaban/webapp/servlet/ScheduleServlet.java#L403-L412
azkaban 4.0.0 Release Notes
Credit: George Chen
Description: Azkaban through 4.0.0 omits project permission checks in the ScheduleServlet fetchSchedule action, allowing authenticated users to read any project's schedule configuration. Attackers can supply arbitrary project and flow identifiers to retrieve sensitive schedule details including execution times, cron expressions, flow parameters, and notification email lists without proper authorization.

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