Auth bypass in Knowns-Dev Knowns
CVE-2026-88939
knowns through 0.33.0 exempts the project.set action from permission guard checks unconditionally, allowing read-only agent sessions to bypass restrictions. Attackers can invoke project.set to repoint the server at another project directory and obtain write access capabilities.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L.
EPSS exploit prediction
EPSS: 0.005 (41.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/knowns-dev/knowns/security/advisories/GHSA-h73x-698r-qrvg (vendor-advisory)
- github.com/knowns-dev/knowns/blob/v0.33.0/internal/permissions/guard.go (technical-description)
- github.com/knowns-dev/knowns/blob/v0.33.0/internal/permissions/registry.go (technical-description)
- www.vulncheck.com/advisories/knowns-through-0.33.0-authorization-bypass-via-pro… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-88939?
- CVE-2026-88939 is a high-severity vulnerability in Knowns-Dev Knowns, classified under Incorrect Authorization. CVSS score: 8.3/10. Published 2026-09-10.
- How severe is CVE-2026-88939?
- High severity. CVSS v3 base score is 8.3 out of 10.