Security readout for executives and security teams
Plain-English summary
CVE-2025-66286 is a medium-severity WebKitGTK/WPE WebKit design flaw. Some web requests can bypass an application’s expected approval check, allowing untrusted web content to make IP connections, DNS lookups, or HTTP requests the application intended to control.
Executive priority
Treat as moderate priority. It is not presented as actively exploited, but it can undermine application-level network controls in affected WebKit-based applications. Prioritize environments where those controls protect sensitive networks or data.
Technical view
Applications using WebPage::send-request may assume it mediates all network requests. The CVE states certain HTTP request types bypass that signal handler, creating an authorization bypass with confidentiality impact. Red Hat lists affected webkitgtk-related packages across RHEL 7, 8, and 9; RHEL 6 status is unknown.
Likely exposure
Exposure is most relevant for Linux desktop or embedded applications using WebKitGTK or WPE WebKit and relying on WebPage::send-request to restrict network access. Red Hat identifies affected packages on RHEL 7, 8, and 9.
Exploitation context
The CVSS vector requires user interaction and network reachability, with low attack complexity and no privileges. The source bundle does not show CISA KEV listing or cited evidence of active exploitation.
Researcher notes
Evidence does not include fixed versions, patch commits, or exploit availability. The key research question is which request paths bypass WebPage::send-request and which applications rely on that signal as a security boundary.
Mitigation direction
- Check Red Hat and WebKit advisories for fixed package availability.
- Prioritize applications relying on WebPage::send-request for network policy enforcement.
- Apply vendor-provided updates or mitigations when published.
- Consider defense-in-depth network egress controls around affected applications.
Validation and detection
- Inventory systems with listed Red Hat webkitgtk-related packages.
- Identify applications using WebKitGTK or WPE WebKit network-request policy hooks.
- Compare installed package status against Red Hat CVE guidance.
- Confirm whether compensating egress controls limit unexpected HTTP, DNS, or IP connections.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-639: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-66286 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.7MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://access.redhat.com/security/cve/CVE-2025-66286CVE reference · vdb-entry, x_refsource_REDHAT
- https://bugs.webkit.org/show_bug.cgi?id=259787CVE reference
- RHBZ#2424652CVE reference · issue-tracking, x_refsource_REDHAT
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Authorization Bypass Through User-Controlled Key
Authorization Bypass Through User-Controlled Key represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.