CVE-2026-86544 Details
Description
knowns versions before 0.30.0 contain an authorization bypass vulnerability where mutating code actions are incorrectly classified as read-only operations. Attackers with read-restricted sessions can exploit code.replace to modify permission configurations and escalate privileges on subsequent calls.
A vulnerability exists in Knowns versions prior to 0.30.0, allowing an authorization bypass in the MCP permission model. Mutating code actions are misclassified as read-only, enabling attackers with read-restricted sessions to exploit the 'code.replace' action. This exploitation involves overwriting the workspace configuration file, '.knowns/config.json', thereby escalating privileges to 'read-write' and 'delete' rights. The issue arises because the permission guard fails to recognize 'code.replace' as a destructive action, allowing unauthorized modifications that can be immediately exploited to delete files outside the project directory.
Upgrade to Knowns version 0.30.0 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 7, 2026CISA-ADP
Assessed Sep 9, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-863 | Incorrect Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| knowns | < 0.30.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 9, 2026 | CVE Modified | CISA-ADP |
| Sep 7, 2026 | New CVE Received | [email protected] |