CVE-2026-107399: Sparklemotion Mechanize

Medium severity, CVSS 6.8. EPSS: 0.4% chance of exploitation in the next 30 days.

The Mechanize library is used for automating interaction with websites. Prior to 2.14.1, Mechanize applies no origin trust boundary in Mechanize::HTTP::Agent#response_follow_meta_refresh when Mechanize#follow_meta_refresh is enabled. A page containing a meta refresh to another origin causes headers configured through Mechanize#request_headers= to be reapplied to the refresh request, allowing an attacker who controls content in the crawl to capture bearer tokens or session cookies. The default configuration is not affected because follow_meta_refresh is false, and the exposure is limited to caller-supplied default headers. This issue is fixed in version 2.14.1.

Affected products

• Sparklemotion Mechanize: before 2.15.0 (fixed in 2.15.0)

Published 2026-10-08. Last modified 2026-10-09.