# CVE-2025-66286: Webkitgtk: authorization bypass through webpage::send-request signal handler

Status: published. Published: 2026-04-23. Updated: 2026-11-05.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 6 (webkitgtk): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (webkitgtk3): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (webkitgtk4): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (webkit2gtk3): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (webkit2gtk3): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 4.7 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N; source: CNA: redhat

- CVSS 3.1: 4.7 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.23% as of 2026-11-05; percentile 14.24%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-639

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2025-66286 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugs.webkit.org/show_bug.cgi?id=259787 (CNA: redhat)

- https://bugzilla.redhat.com/show_bug.cgi?id=2424652 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2025-66286 (secalert@redhat.com)

- https://bugs.webkit.org/show_bug.cgi?id=259787 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2424652 (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2025-66286; retrieved 2026-11-05; source updated 2026-11-05

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-66286; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-66286; retrieved 2026-11-05; source updated Not reported

Revision: 2354fd243cccafddf534e24475e6207e8bac4618b15f0f1c67bf3d4a65d52b9d

Canonical: https://y2.dev/cve/CVE-2025-66286

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.