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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (35.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Its-A-Feature Mythic — versions 0
Weakness classification (CWE)
References
- github.com/its-a-feature/Mythic/commit/82648e8241b800a32e1882afc310e7316d98ebaa (Patch, patch)
- github.com/its-a-feature/Mythic/issues/563 (issue-tracking, Issue Tracking)
- github.com/its-a-feature/Mythic/releases/tag/v3.4.0.60 (release-notes, Release Notes)
- www.vulncheck.com/advisories/mythic-broken-permission-filter-in-payload-build-s… (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.