What is CVE-2026-107715?

CVE-2026-107715 is a medium-severity vulnerability in Sparklemotion Mechanize, classified under Information Disclosure. CVSS score: 6.8/10. Published 2026-10-08.

How severe is CVE-2026-107715?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Information disclosure in Sparklemotion Mechanize

CVE-2026-107715

The Mechanize library is used for automating interaction with websites. Prior to 2.14.1, Mechanize sends caller-supplied credential headers to a different host after an HTTP redirect. Mechanize#request_headers= is reapplied by Mechanize::HTTP::Agent#request_add_headers even after Mechanize::HTTP::Agent#response_redirect strips per-request headers, and the protected header lists omit Proxy-Authorization and Cookie2. An attacker who controls a redirect target can capture bearer tokens or session cookies supplied through request_headers= or the per-request headers argument, while Mechanize#cookie_jar and Mechanize::HTTP::AuthStore are not affected. This issue is fixed in version 2.14.1.

Vulnerability class: Information Disclosure

Published 2026-10-08 · last modified 2026-10-09.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Sparklemotion Mechanize — versions < 2.15.0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-107715?: CVE-2026-107715 is a medium-severity vulnerability in Sparklemotion Mechanize, classified under Information Disclosure. CVSS score: 6.8/10. Published 2026-10-08.
How severe is CVE-2026-107715?: Medium severity. CVSS v3 base score is 6.8 out of 10.