Auth bypass in Its-A-Feature Mythic
CVE-2026-57951
Mythic before 3.4.0.60 contains a broken hasura permission filter on the payload_build_step table with an always-satisfied _or condition that bypasses operation-scoped access controls. Authenticated operators and spectators can query payload_build_step to read step_stdout, step_stderr, step_name, and step_description across all operations on the server.
Vulnerability class: Broken Access Control
EPSS: 0.002 (16.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Its-a-feature Mythic — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (Patch, patch)
- disclosure@vulncheck.com (issue-tracking, Issue Tracking)
- disclosure@vulncheck.com (release-notes, Release Notes)
- disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-57951?
- CVE-2026-57951 is a medium-severity vulnerability in Its-A-Feature Mythic, classified under Incorrect Authorization. CVSS score: 6.5/10. Published 2026-06-29.
- How severe is CVE-2026-57951?
- Medium severity. CVSS v3 base score is 6.5 out of 10.