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Vulnerability record · CVE-2026-88058 · published 10 September 2026

CVE-2026-88058: Cross-site scripting vulnerability

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.

8.6 CVSS 4.0 High EPSS 0.88% · top 42.6% CWE-79 · Cross-site scriptingCWE-116 · CWE-116 Undergoing Analysis
8.6CVSS 4.0 base score
0.88%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
11References
11 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/angular/angular/commit/73d8bbd27cb46495426d4132975a1355b47ad915
https://github.com/angular/angular/commit/89b20568dfaee1ec8e0b3bcf1872acdddd2f4fef
https://github.com/angular/angular/commit/ba3bc47b20b3d12f5eb141ec9c651373ae4d15e8
https://github.com/angular/angular/issues/70146
https://github.com/angular/angular/releases/tag/v20.3.30
https://github.com/angular/angular/releases/tag/v21.2.22
https://github.com/angular/angular/releases/tag/v22.1.4
https://github.com/angular/angular/security/advisories/GHSA-j3r3-mxqp-r2p4
https://github.com/angular/domino/commit/04f987dc08ff3736b427f50941adf1722458528f
https://github.com/angular/angular/issues/70146
https://github.com/angular/angular/security/advisories/GHSA-j3r3-mxqp-r2p4

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Source: NIST National Vulnerability Database (record CVE-2026-88058), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.