EUVD-2026-87829
GHSA-gxgj-2794-2q5v
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
Network-reachable expression engine, low complexity, requires an authenticated low-privilege account (PR:L), and code execution as the backend process yields full C/I/A impact with no scope change.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
heym before 0.0.91 contains a sandbox escape vulnerability in the expression engine's DotList map/filter and fallback resolver that allows authenticated users to execute arbitrary Python code. Attackers can craft workflow expressions using dunder attribute access through item expressions or the fallback resolver to access os.system and execute commands as the backend process.
Articles & Coverage 1
AnalysisAI
Sandbox escape in the heym workflow platform before 0.0.91 allows an authenticated user who can author or edit workflow expressions to execute arbitrary Python and run operating-system commands as the backend process. The flaw lives in the expression engine's DotList map/filter item expressions and its fallback resolver, which fail to block dunder attribute traversal, letting an attacker chain attributes to reach functions such as os.system. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated account on the heym backend (PR:L) with the ability to author or modify workflow expressions. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H, base 8.7) describes a network-reachable, low-complexity, low-privilege sandbox escape yielding full code execution - a genuinely high technical impact. … 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 | Upgrade heym to 0.0.91 or later, which is the vendor-released patch that hardens the expression engine against dunder attribute access in DotList map/filter item expressions and the fallback resolver; see GHSA-87x2-9jwx-7gh4 (https://github.com/heymrun/heym/security/advisories/GHSA-87x2-9jwx-7gh4) for the upstream fix details. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, restrict workflow-authoring privileges in heym to only essential trusted users, audit existing workflows for malicious expressions, and enable detailed logging to monitor for suspicious Python execution or OS command invocation; within 7 days, implement network segmentation to limit lateral movement from the heym backend, consider temporarily disabling the workflow authoring feature if business operations allow, and apply any vendor-provided workarounds or hotfixes as they become available; within 30 days, plan an upgrade to heym version 0.0.91 or later once it is released, conduct a thorough security review of the platform, and establish a patching cadence to ensure timely remediation of future vulnerabilities.
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External POC / Exploit Code
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