CVE-2026-54267
Description
A flaw was found in the Angular framework's client-side hydration feature for Server-Side Rendered (SSR) applications. This vulnerability, known as DOM Clobbering, allows a remote attacker to inject malicious data into the application's internal data cache. By exploiting a predictable identifier used to recover application state, an attacker can trick Angular into processing their controlled content instead of the legitimate one. This can lead to poisoning the HTTP Transfer Cache, potentially resulting in Cross-Site Scripting (XSS), where attackers can execute unauthorized code in a user's browser, privilege escalation, or user interface hijacking.
Statement
Red Hat products do not ship an @angular/core version within the vulnerable range (>= 22.0.0-next.0, < 22.0.1). Additionally, no Red Hat product ships or uses Angular's Server-Side Rendering hydration feature (@angular/platform-server, @angular/ssr, provideClientHydration()) that this vulnerability depends on. Existing Angular usage in Red Hat's portfolio (Red Hat Advanced Cluster Management's volsync UI, Red Hat Integration Service Registry UI) uses versions outside the vulnerable range and does not implement client hydration with untrusted input bound to DOM element IDs.
Mitigation
No mitigation is required. Red Hat products are not affected by this vulnerability, as detailed in the statement above.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4.7 | 6.1 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | High | Low | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | Required | Required | N/A |
| Scope | Changed | Changed | N/A |
| Confidentiality | Low | Low | N/A |
| Integrity Impact | Low | Low | N/A |
| Availability Impact | None | None | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Red Hat CVSS v3 Score Explanation
RH assessment: DOM Clobbering requires the SSR app to use provideClientHydration() AND bind untrusted input to an element id before the ng-state tag is parsed (AC:H, non-default precondition). Impact limited to client-side TransferState/HTTP cache poisoning within the victim's own session (C:L/I:L/A:N), scope changed since poisoned cache affects arbitrary subsequent API responses beyond the hydration mechanism itself (S:C). Requires victim to load a crafted page (UI:R).
Understanding the Weakness (CWE)
Confidentiality,Access Control,Availability,Other
Technical Impact: Bypass Protection Mechanism; Gain Privileges or Assume Identity; Varies by Context
Attackers can bypass the security decision to access whatever is being protected. The consequences will depend on the associated functionality, but they can range from granting additional privileges to untrusted users to bypassing important security checks. Ultimately, this weakness may lead to exposure or modification of sensitive data, system crash, or execution of arbitrary code.
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