Auth bypass in Free5gc
CVE-2026-40247
free5GC is an open-source implementation of the 5G core network. In versions 4.2.1 and below of the UDR service, the handler for reading Traffic Influence Subscriptions checks whether the influenceId path segment equals subs-to-notify, but…
EPSS: 0.005 (39.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Free5gc — versions <= 1.4.2
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Third Party Advisory, Mitigation)
Frequently asked questions
- What is CVE-2026-40247?
- CVE-2026-40247 is a high-severity vulnerability in Free5gc, classified under Improper Authorization. CVSS score: 7.5/10. Published 2026-04-16.
- How severe is CVE-2026-40247?
- High severity. CVSS v3 base score is 7.5 out of 10.