CVE-2026-53820
OpenClaw < 2026.5.12 - Exec Denylist Bypass in Bundle MCP Loopback Session Spawn
Description
OpenClaw before 2026.5.12 contains an exec denylist bypass vulnerability in the bundle MCP loopback session-spawn path that allows authenticated callers to bypass intended command restrictions. Attackers can reach the affected bundled MCP session-spawn path to start sessions with broader command reach than intended.
INFO
Published Date :
June 12, 2026, 10:16 p.m.
Last Modified :
June 17, 2026, 10:58 a.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update OpenClaw to version 2026.5.12 or newer.
- Apply vendor patches if available.
- Review and restrict authenticated user permissions.
- Monitor for unauthorized session activity.
Public PoC/Exploit Available at Github
CVE-2026-53820 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-53820.
| URL | Resource |
|---|---|
| https://github.com/openclaw/openclaw/security/advisories/GHSA-qh2f-99mv-mrcf | Mitigation Vendor Advisory |
| https://www.vulncheck.com/advisories/openclaw-exec-denylist-bypass-in-bundle-mcp-loopback-session-spawn | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53820 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-53820
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
The Project shares all information on MCP related CVE's published
mcp mcp-security mcp-cve
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-53820 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53820 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/openclaw/openclaw', 'vendor': 'OpenClaw', 'product': 'OpenClaw', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2026.5.12', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '2026.5.12', 'versionType': 'semver'}], 'packageURL': 'pkg:npm/openclaw', 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-53820', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-15T12:59:36.645971Z'} -
Initial Analysis by [email protected]
Jun. 16, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:* versions up to (excluding) 2026.5.12 Added Reference Type VulnCheck: https://github.com/openclaw/openclaw/security/advisories/GHSA-qh2f-99mv-mrcf Types: Mitigation, Vendor Advisory Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/openclaw-exec-denylist-bypass-in-bundle-mcp-loopback-session-spawn Types: Third Party Advisory -
New CVE Received by [email protected]
Jun. 12, 2026
Action Type Old Value New Value Added Description OpenClaw before 2026.5.12 contains an exec denylist bypass vulnerability in the bundle MCP loopback session-spawn path that allows authenticated callers to bypass intended command restrictions. Attackers can reach the affected bundled MCP session-spawn path to start sessions with broader command reach than intended. Added CVSS V4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/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 Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L Added CWE CWE-862 Added Reference https://github.com/openclaw/openclaw/security/advisories/GHSA-qh2f-99mv-mrcf Added Reference https://www.vulncheck.com/advisories/openclaw-exec-denylist-bypass-in-bundle-mcp-loopback-session-spawn