CVE-2026-108736 Speedtest Tracker through 1.15.0 IP Allowlist Bypass via X-Forwarded-For Spoofing
Attackers can bypass IP allowlists by spoofing X-Forwarded-For headers to access protected metrics and API endpoints in Speedtest Tracker.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-108736?
CVE-2026-108736 is a medium-severity authentication bypass vulnerability in alexjustesen speedtest-tracker, published on 11 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Speedtest Tracker through 1.15.0 contains an IP allowlist bypass vulnerability that allows unauthenticated remote attackers to evade ALLOWED_IPS and Prometheus allowlists by spoofing X-Forwarded-For headers. Because bootstrap/app.php trusts every peer as a proxy, attackers can supply an allowlisted address to read /prometheus metrics and reach protected web and API endpoints.
Weakness: CWE-348
Which versions are affected by CVE-2026-108736?
How do I fix CVE-2026-108736?
No fix has been published for CVE-2026-108736 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-108736 being exploited?
There is no known exploitation of CVE-2026-108736 in the wild and no public exploit code.
Sources
Also known as GHSA-5mh8-m8gg-2f9w.