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RestrictedPython CVE-2026-55830

| EUVDEUVD-2026-42434 HIGH
Incomplete List of Disallowed Inputs (CWE-184)
2026-06-23
Authentication Bypass Python
8.3
CVSS 3.1 · Vendor
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Severity by source

Vendor (CNA) PRIMARY
8.3 HIGH
AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L
vuln.today AI
8.5 HIGH

Network-delivered via web interface; AC:H reflects non-trivial sandbox escape craft; PR:L for required script-authoring role; S:C for full sandbox boundary break.

3.1 AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Primary rating from Vendor (CNA).

CVSS VectorVendor

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low

Lifecycle Timeline

3
Patch available
Jul 08, 2026 - 23:04 EUVD
CVSS changed
Jul 08, 2026 - 22:22 NVD
8.3 (HIGH)
Analysis Generated
Jun 23, 2026 - 20:16 vuln.today

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

AnalysisAI

Sandbox escape in RestrictedPython (zopefoundation/RestrictedPython, GHSA-ffg3-p8fm-mjx2) allows an authenticated attacker who can execute code within the restricted Python environment to break out of that sandbox and execute arbitrary Python on the underlying host. This affects Plone deployments that rely on RestrictedPython to safely run through-the-web (TTW) Python Scripts and TALES expressions. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate with script-authoring Plone account
Delivery
Navigate to Python Script editor or TTW TALES context
Exploit
Craft introspection-based sandbox escape payload
Execution
Submit payload for server-side execution
Persist
RestrictedPython guard bypassed
Impact
Execute arbitrary code as web server process
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated account in the Plone or Zope application with permission to create, edit, or execute Python Script objects or TALES Python expressions through the web interface - this is a non-default, explicitly granted role (typically Manager or a custom role with 'Add Python Scripts' ZMI permission). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The stated vendor severity is 8.3 high. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with a Plone account that has 'Script (Python)' authoring permissions - for example, a content editor on a multi-contributor site - navigates to the Zope Management Interface or Plone's script editor and submits a crafted Python script containing an introspection-based sandbox bypass (e.g., traversing __class__.__mro__ or abusing guard function gaps). Upon execution, the payload escapes the RestrictedPython sandbox and runs arbitrary code as the web server process user, potentially enabling full server compromise. …
Remediation Upgrade RestrictedPython to the patched version identified in the GitHub Security Advisory at https://github.com/zopefoundation/RestrictedPython/security/advisories/GHSA-ffg3-p8fm-mjx2 - the exact fixed version is not confirmed in the provided input and must be read from the advisory directly. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-55830 vulnerability details – vuln.today
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