EUVD-2026-87830
GHSA-grmf-qq9c-vgpp
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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
Anchored to the strongest flaw: authenticated workflow-editor (PR:L) reaches unsandboxed eval() for full RCE with high C/I/A; network vector, low complexity, no UI for that path.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
Heym before 0.0.53 contains multiple independent vulnerabilities. (1) The workflow condition evaluator uses Python eval() without an effective sandbox, allowing any user who can edit a workflow branch/condition node - or who can import a workflow template containing a malicious condition node - to execute arbitrary Python code as the backend process user when the workflow runs. (2) Slack webhook signature verification and (3) Telegram webhook secret-token verification fail open when the trigger node has no credentialId or an empty signing secret, allowing anyone who knows the public webhook URL to trigger workflows with the owner's credentials without authentication. (4) The OAuth authorization endpoint does not validate the redirect_uri scheme, so an attacker who registers a public OAuth client with a javascript: or data: redirect_uri and lures a victim to the consent screen receives the authorization code and executes attacker-controlled JavaScript in the Heym origin, including access to the victim's HttpOnly auth cookie. (5) WorkflowExecutionToken, PortalSession, HITLRequest.public_token, and OAuthAuthorizationCode values are stored in plaintext, so any database read exposure yields valid scoped bearer tokens, including portal and HITL tokens with a 168-hour TTL that permit workflow execution on behalf of the owner.
Articles & Coverage 1
AnalysisAI
Python eval()-based remote code execution in Heym (heymrun/heym) before 0.0.53 lets an authenticated user who can edit a workflow branch or condition node - or a victim who imports a workflow template containing a malicious condition node - run arbitrary Python as the backend process user whenever the workflow executes. The same release bundles four further flaws: fail-open Slack and Telegram webhook verification that allows unauthenticated workflow triggering with the owner's credentials when a trigger node has no credentialId or an empty signing secret, an OAuth redirect_uri scheme-validation gap that permits javascript:/data: URIs and script execution in the Heym origin, and plaintext storage of WorkflowExecutionToken, PortalSession, HITLRequest.public_token and OAuthAuthorizationCode values. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Flaw (1) RCE requires an authenticated account able to edit a workflow branch/condition node, OR a victim importing a workflow template containing a malicious condition node - no special server configuration, but backend workflow execution must occur. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H) scores 8.7 and is anchored to the strongest of the five bundled flaws - the sandbox-less Python eval() in the workflow condition evaluator, which grants full RCE to any authenticated user who can edit or import a workflow condition node (PR:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade Heym to 0.0.53 or later, which the advisory at https://github.com/heymrun/heym/security/advisories/GHSA-pm6h-x3h5-j38h identifies as the fixed release. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every Heym 0.0.x deployment and confirm whether any instance runs outside an isolated, non-production environment; disable workflow template import and third-party workflow sharing; configure every trigger node with an explicit credentialId and a non-empty signing secret; rotate all potentially exposed secrets (WorkflowExecutionToken, PortalSession, HITLRequest.public_token, OAuthAuthorizationCode) and cut the backend service account down to least privilege. …
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External POC / Exploit Code
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