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CVE-2026-88058

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 8.6 · High · EPSS 0.3% · Fix available

Published
Updated

Stack: system · node

Affected products and versions

  • angular

    Versions
    • <= 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

    No fix published

  • angular.js Debian:12

    Versions
    • 1.8.3-1
    • 1.8.3-1+deb12u1
    • 1.8.3-1+deb12u1~deb11u1
    • 1.8.3-2
    • 1.8.3-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • angular.js Debian:13

    Versions
    • 1.8.3-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • @angular/platform-server npm

    Affected ranges
    • SEMVER: ≥ 22.0.0, < 22.1.4

    Update to 22.1.4

  • @angular/platform-server npm

    Affected ranges
    • SEMVER: ≥ 21.0.0, < 21.2.22

    Update to 21.2.22

  • @angular/platform-server npm

    Affected ranges
    • SEMVER: ≥ 20.0.0, < 20.3.30

    Update to 20.3.30

  • @angular/platform-server npm

    Affected ranges
    • SEMVER: ≤ 19.2.25

    No fix published

  • angular.js Ubuntu:Pro:16.04:LTS

    Versions
    • 1.2.28-1ubuntu2
    • 1.2.28-1ubuntu2+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • angular.js Ubuntu:Pro:18.04:LTS

    Versions
    • 1.5.10-1
    • 1.5.10-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • angular.js Ubuntu:Pro:20.04:LTS

    Versions
    • 1.5.10-1
    • 1.7.9-1
    • 1.7.9-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • angular.js Ubuntu:22.04:LTS

    Versions
    • 1.8.2-2
    • 1.8.2-2ubuntu0.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • angular.js Ubuntu:24.04:LTS

    Versions
    • 1.8.3-1
    • 1.8.3-1ubuntu0.24.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • angular.js Ubuntu:26.10

    Versions
    • 1.8.3-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • angular.js Ubuntu:26.04:LTS

    Versions
    • 1.8.3-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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