Vulnerability · Published Jun 29, 2026 · Assigned by VulnCheck
CVE-2026-57951Mythic < 3.4.0.60 - Broken Permission Filter in payload_build_step Table
Medium 6.5
In plain English
A medium-severity incorrect authorization in Mythic from its-a-feature. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.4%top 62.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| its-a-feature | Mythic | 0 – before 3.4.0.60 |
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
References
- Release Notes release-notes
- Researcher Disclosure issue-tracking
- Patch Commit patch
- https://www.vulncheck.com/advisories/mythic-broken-permission-filter-in-payload-build-step-table third-party-advisory
- ttps://github.com/its-a-feature/Mythic/issues/563 exploit