Auth bypass in Knowns-Dev Knowns
CVE-2026-86544
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003
Affected products
Weakness classification (CWE)
References
- Guard middleware gates on that classification (v0.29.1) (technical-description)
- ActionRegistry omits the mutating code actions; ClassifyAction falls back to CapRead (v0.29.1) (technical-description)
- knowns fix commit a2c98fc5c313 (patch)
- knowns v0.30.0 Release Notes (release-notes)
- GitHub Security Advisory (GHSA-w323-3wpx-f7g5) (vendor-advisory)
- VulnCheck Advisory: knowns before 0.30.0 Authorization Bypass via Misclassified Code Actions (third-party-advisory)
Frequently asked questions
- What is CVE-2026-86544?
- CVE-2026-86544 is a high-severity vulnerability in Knowns-Dev Knowns, classified under Incorrect Authorization. CVSS score: 8.1/10. Published 2026-09-07.
- How severe is CVE-2026-86544?
- High severity. CVSS v3 base score is 8.1 out of 10.