Vulnerability · Published Jul 13, 2026 · Assigned by VulnCheck

CVE-2026-623279Router 0.4.41 - Unauthenticated API Key Exposure via /api/usage/stats

Critical 9.1

In plain English

A critical-severity missing authentication in 9Router from decolua. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 6.3% (higher than 94% of all known vulnerabilities).

Severity (CVSS 3.1)9.1Critical

Exploit odds (30 days)6.3%top 6.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	9router	no fix listed	GHSA-vjc7-jrh9-9j86

Affected products (as reported)

Vendor	Product	Versions
decolua	9Router	0 – through 0.4.41

Weakness: CWE-306, CWE-522 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

GitHub Security Advisory (GHSA-vjc7-jrh9-9j86) vendor-advisory
VulnCheck Advisory: 9Router 0.4.41 - Unauthenticated API Key Exposure via /api/usage/stats third-party-advisory