CVE-2026-65697: medium-severity vulnerability in usefathom fathom
Fathom Lite 1.3.1 Stored XSS via /collect Endpoint
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
33Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 5.1epss 0.3%
Fathom Lite through 1.3.1 contains a stored cross-site scripting vulnerability in the analytics collection endpoint that allows unauthenticated attackers to inject a javascript: URI into the Top Pages dashboard by supplying a crafted hostname and pathname to the unauthenticated /collect endpoint. The parseHostname and parsePathname functions perform no URI scheme validation, allowing a javascript: hostname combined with a newline-prefixed pathname to be stored and later rendered as an anchor href in the authenticated dashboard without sanitization, enabling session hijacking and full account takeover when an operator clicks the poisoned entry.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Affected products
usefathom · fathompublic PoCs found — 1
cve_referencegithub.com/geo-chen/oss/blob/main/fathom.mdunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.