EUVD-2026-40168
GHSA-9f32-pf5h-p947
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable Hasura API with only a low-privilege operator/spectator login (PR:L, AC:L); pure cross-operation data read gives C:H with no integrity or availability impact and unchanged scope.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Cross-operation information disclosure in Mythic C2 framework versions before 3.4.0.60 allows any authenticated operator or spectator to read payload build artifacts belonging to operations they are not assigned to. A broken Hasura GraphQL permission filter on the payload_build_step table contains an always-true _or clause, neutralizing the operation-scoped row-level access control and exposing step_stdout, step_stderr, step_name, and step_description across every operation on the server. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated Mythic account with at least operator or spectator role on the target server (PR:L) and a multi-operation deployment where more than one operation's data exists to be disclosed - on a single-operation server there is nothing cross-tenant to leak. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N) scores 7.1 and is internally consistent with the description: network-reachable, low complexity, requires low privileges (a valid operator/spectator login), no user interaction, with high confidentiality impact and no integrity or availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An operator or spectator who has been granted access to one engagement on a shared Mythic server logs in and issues a standard GraphQL query against the payload_build_step table. Because the permission filter is always satisfied, the server returns build step stdout/stderr, names, and descriptions for payloads belonging to every other team's operation, revealing their tooling and configuration. … |
| Remediation | Vendor-released patch: upgrade Mythic to version 3.4.0.60 or later, which corrects the Hasura select permission on payload_build_step (release notes at https://github.com/its-a-feature/Mythic/releases/tag/v3.4.0.60, fix commit 82648e8241b800a32e1882afc310e7316d98ebaa, advisory at https://www.vulncheck.com/advisories/mythic-broken-permission-filter-in-payload-build-step-table). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Mythic C2 deployments running versions before 3.4.0.60; audit access logs for unauthorized cross-operation artifact access; restrict GraphQL API to trusted networks if operationally feasible. …
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Cross-operation authorization bypass in Mythic C2 framework before 3.4.0.60 exposes encryption keys and C2 profile confi
Authorization bypass in Mythic C2 framework before 3.4.0.60 allows authenticated spectator-role users to perform write o
Same weakness CWE-863 – Incorrect Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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