Auth bypass in Red Hat Enterprise Linux 6
CVE-2025-66286
An API design flaw in WebKitGTK and WPE WebKit allows untrusted web content to unexpectedly perform IP connections, DNS lookups, and HTTP requests. Applications expect to use the WebPage::send-request signal handler to approve or reject all network requests. However, certain types of HTTP requests bypass this signal handler.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.002 (12.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 12.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2025-66286 (vdb-entry)
- bugs.webkit.org/show_bug.cgi
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
Frequently asked questions
- What is CVE-2025-66286?
- CVE-2025-66286 is a medium-severity vulnerability in Red Hat Enterprise Linux 6, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.7/10. Published 2026-04-23.
- How severe is CVE-2025-66286?
- Medium severity. CVSS v3 base score is 4.7 out of 10.