CVE-2026-87453
Google Chrome ≤ 153.0.8010.36
Raw vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:NCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2026-87453 is a medium-severity Confused Deputy (CWE-441) vulnerability in Google Chrome. Its CVSS base score is 5.3 (Medium).
Operationally, ranked at the 18th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to AC-16 (Security and Privacy Attributes) and AC-4 (Information Flow Enforcement) — see the control section below for these in your framework.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-74535
Vulnerability Data
Confused deputy in BackgroundFetch in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to leak sensitive information via a crafted HTML page. (Chromium security severity: Medium)
- CWE(s)
Related Threats
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Associating and preserving security attributes such as original source identity prevents the loss of provenance that creates the confused deputy.
Information flow enforcement requires preserving and checking source attributes before forwarding requests outside the trust boundary.
Access enforcement directly stops a component from acting on forwarded requests without verifying original source authorizations.
Boundary protection limits and inspects external forwarding, reducing the ability of an intermediary to act as an unintended proxy.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
A.5.15 only requires defining and documenting an access control policy plus requirements; it does not itself enforce rules or stop a confused-deputy proxy from being introduced or exploited.
A.5.16 governs identity lifecycle, uniqueness, accountability and timely removal to support proper access rights assignment; it has no bearing on preserving original request sources or stopping confused-deputy proxying when a product forwards an upstream request.
Explicit access-rights assignment can restrict the product’s ability to act as an unintended proxy for external actors.
Privileged-access controls limit the rights the product may exercise on behalf of upstream callers, mitigating confused-deputy abuse.
Network-security controls can enforce source validation and prevent the product from blindly proxying traffic to external actors.
Secure-SDLC practices include design reviews that detect and eliminate confused-deputy proxy patterns before deployment.
Hardening callouts derived
DISA STIG baselines are authored against specific weaknesses. Where this CVE cites a broad weakness class, the mapping is not asserted at that abstraction (owner ruling, 2026-09-25: grade only at Base and below), so no rule is shown here rather than a rule shown against the wrong grain.
- No fine-grained STIG row for CWE-441, a class-level weakness, and none of its children carries one either.