Vulnerability · Published Oct 11, 2026 · Assigned by VulnCheck

CVE-2026-108736Speedtest Tracker through 1.15.0 IP Allowlist Bypass via X-Forwarded-For Spoofing

Low 3.7

In plain English

A low-severity security flaw in speedtest-tracker from alexjustesen. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).

Severity (CVSS 3.1)3.7Low

Exploit odds (30 days)0.2%top 89.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
alexjustesen	speedtest-tracker	0 – through 1.15.0

Weakness: CWE-348 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

References

https://hackmd.io/@haind03/speedtest-tracker-trust-proxies-allowlist-bypass third-party-advisory
https://github.com/alexjustesen/speedtest-tracker/blob/fce6eb36181ed70b5b0763c391a50b806d7e3da7/bootstrap/app.php#L23-L41 technical-description
https://github.com/alexjustesen/speedtest-tracker/blob/fce6eb36181ed70b5b0763c391a50b806d7e3da7/app/Http/Middleware/AllowedIpAddressesMiddleware.php#L16-L27 technical-description
https://github.com/alexjustesen/speedtest-tracker/blob/fce6eb36181ed70b5b0763c391a50b806d7e3da7/app/Http/Middleware/PrometheusAllowedIpMiddleware.php#L22-L42 technical-description
https://github.com/alexjustesen/speedtest-tracker product
VulnCheck Advisory: Speedtest Tracker through 1.15.0 IP Allowlist Bypass via X-Forwarded-For Spoofing third-party-advisory