9Router 0.4.41 - Unauthenticated API Key Exposure via /api/usage/stats

published 2026-07-13 3 mo ago modified 2026-10-24 15 d ago also EUVD-2026-43547

cvss: 9.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 6.3%; EPSS 6.3% chance of exploitation in 30 days, percentile 93%
public exploits: 0; none known

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.

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: total
Assessed: 3 mo ago (2026-07-14)

Exploit prediction

6.27% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/decolua/9router/security/advisories/GHSA-vjc7-jrh9-9j86 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	9.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CNA	3.1	9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CNA	4.0	9.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

decolua 9Router

Classification

Weakness

CWE-306 Missing Authentication for Critical Functionality
CWE-522 Insufficiently Protected Credentials

References

github.com /decolua/9router/security/advisories/GHSA-vjc7-jrh9-9j86
vendor-advisory, exploit
vulncheck.com /advisories/9router-unauthenticated-api-key-exposure-via-api-usage-stats
third-party-advisory

Sources

CVE List CVE-2026-62327
NVD CVE-2026-62327

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary