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CVE-2026-88058— Angular: SSR XSS via Unescaped Processing Instruction (<?...?>) Nodes in Fallback Raw-Content Elements

Quick assessment

Affected
angular angular
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Angular 是一个使用 TypeScript/JavaScript 及其他语言构建移动端和桌面端 Web 应用的开发平台。在 20.3.30、21.2.22 和 22.1.4 版本之前，Angular 的服务端渲染（SSR，通过 提供）在将 DOM 节点序列化到 fallback 原始内容元素中时，未对匹配的祖先闭合标签进行转义。 的数据仅转义了大于号（ ）字符，而未转义小于号（ ）字符，且未检查 fallback 祖先元素。因此，数据中出现的匹配闭合标签（如 、 、 或 ）可能会过早地终止这些容器元素。 这些

CVSS 8.6 · High

Affected Version Matrix 4

VendorProduct Version RangeStatus
angular angular <= 19.2.25 affected
>= 20.0.0, < 20.3.30 affected
>= 21.0.0, < 21.2.22 affected
>= 22.0.0, < 22.1.4 affected
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I. Basic Information for CVE-2026-88058

Vulnerability Information
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Vulnerability Title
Angular: SSR XSS via Unescaped Processing Instruction (<?...?>) Nodes in Fallback Raw-Content Elements
Source: CVE Program / CVE List V5
Vulnerability Description
Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 20.3.30, 21.2.22, and 22.1.4, Angular server-side rendering (SSR) in @angular/platform-server serializes ProcessingInstruction DOM nodes inside fallback raw-content elements without escaping matching ancestor closing tags. ProcessingInstruction data escaped greater-than characters but left less-than characters untouched and did not inspect fallback ancestors, so data such as a matching closing tag prematurely terminates noscript, iframe, noembed, or noframes containers. The vulnerable nodes cannot be authored through standard Angular templates; reachability requires application or library code using inject(DOCUMENT).createProcessingInstruction with attacker-controlled data or Renderer2 DOM insertion inside a fallback container. In HTML5 RAWTEXT parsing, the premature close causes subsequent sibling elements to be interpreted as live HTML and enables arbitrary JavaScript execution in a victim's browser. This issue is fixed in versions 20.3.30, 21.2.22, and 22.1.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
angular angular <= 19.2.25 -

II. Public POCs for CVE-2026-88058

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III. Intelligence Information for CVE-2026-88058

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Patches & Fixes for CVE-2026-88058 (5)

Vendor Advisories for CVE-2026-88058 (1)

Vendor Pages for CVE-2026-88058 (3)

Same Patch Batch · angular · 2026-09-10 · 5 CVEs total

CVE-2026-88056 8.6 HIGH Angular: SSRF and Cross-Origin Credential Disclosure via URL Resolution Discrepancy in SSR
CVE-2026-88060 8.6 HIGH Angular: SSR XSS via Unescaped <template> Content Across DocumentFragment Boundaries in Fa
CVE-2026-88057 5.3 MEDIUM Angular: Sanitization bypass via directive host bindings on concrete host elements in @ang
CVE-2026-88059 4.0 MEDIUM Angular: Information Leak via `HttpTransferCache` Bypass When Using `withRequestsMadeViaPa

IV. Related Vulnerabilities

Same product: angular
Same vendor: angular
Same weakness: CWE-79

V. Comments for CVE-2026-88058

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