Auth bypass in Decolua 9router
CVE-2026-62327
9Router through version 0.4.41 contains an unauthenticated information disclosure vulnerability that allows remote attackers to retrieve plaintext API keys for all connected AI provider accounts by sending a single unauthenticated request to the /api/usage/stats endpoint. Attackers can exploit the missing authentication middleware on the Next.js API route to obtain full API key strings alongside token counts, cost breakdowns, and request metadata, enabling unauthorized use of connected AI provider accounts, billing fraud, and quota exhaustion.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.006 (49.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Decolua 9router — versions 0
Weakness classification (CWE)
References
- github.com/decolua/9router/security/advisories/GHSA-vjc7-jrh9-9j86 (vendor-advisory)
- www.vulncheck.com/advisories/9router-unauthenticated-api-key-exposure-via-api-u… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-62327?
- CVE-2026-62327 is a critical-severity vulnerability in Decolua 9router, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2026-07-13.
- How severe is CVE-2026-62327?
- Critical severity. CVSS v3 base score is 9.1 out of 10.