CVE-2026-66005
Last modified
CVE-2026-66005 is a medium-severity vulnerability rated 6.3/10 on the CVSS scale. Jan through 0.8.4, fixed in commit 3e1c1e7, contains a CORS misconfiguration vulnerability in its local API server that allows network-adjacent attackers to bypass trusted host restrictions by exploiting the server's replacement of user-configured trusted hosts with a wildcard that reflects arbitrary origins with credentials. Attackers on the local network or using DNS rebinding can reach the unauthenticated OpenAI-compatible API to perform inference, enumerate models, invoke MCP tools, and read cross-origin responses.. EPSS estimates a 0.19% chance of exploitation in the next 30 days.
Description
Jan through 0.8.4, fixed in commit 3e1c1e7, contains a CORS misconfiguration vulnerability in its local API server that allows network-adjacent attackers to bypass trusted host restrictions by exploiting the server's replacement of user-configured trusted hosts with a wildcard that reflects arbitrary origins with credentials. Attackers on the local network or using DNS rebinding can reach the unauthenticated OpenAI-compatible API to perform inference, enumerate models, invoke MCP tools, and read cross-origin responses.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/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
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| janhq | jan | <= 0.8.4 |
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
What is CVE-2026-66005?
How severe is CVE-2026-66005?
How do I fix CVE-2026-66005?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-65981Coturn is a free open source implementation of TURN and STUN…7.1
- CVE-2026-65986CVAT is an open source interactive video and image annotatio…8.5
- CVE-2026-6599A vulnerability was detected in langflow-ai langflow up to 1…6.3
- CVE-2026-6600A flaw has been found in langflow-ai langflow up to 1.8.3. T…3.5
- CVE-2026-66000Frappe is a full-stack web application framework. Prior to 1…2.3
- CVE-2026-66004BlenderMCP before commit 30a3308 contains a path traversal v…6
- CVE-2026-66006lakeFS through 1.83.0, fixed in commit 71a45ee, contains an …6.9
- CVE-2026-66007Datasets through 5.0.0, fixed in commit f989ef9, contains a …6.9
- CVE-2026-66008Parse Server versions >= 9.0.0 before 9.10.0-alpha.6 and >= …6.3
- CVE-2026-66009Parse Server versions >= 9.0.0 before 9.10.0-alpha.5 and >= …6.3
- CVE-2026-6601A vulnerability has been found in Lagom WHMCS Template up to…4.3
- CVE-2026-66010DOMPurify before 3.4.12 fails to execute afterSanitizeElemen…6.1
Are you affected by CVE-2026-66005?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST