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Vulnerability · Published Sep 10, 2026 · Assigned by GitHub_M

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

High 8.6

In plain English

A high-severity cross-site scripting in angular from angular. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.6High
Exploit odds (30 days)0.3%top 79.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12angular.jsno fix listedDEBIAN-CVE-2026-88058
Debian:13angular.jsno fix listedDEBIAN-CVE-2026-88058
Ubuntu:22.04:LTSangular.jsno fix listedUBUNTU-CVE-2026-88058
Ubuntu:24.04:LTSangular.jsno fix listedUBUNTU-CVE-2026-88058
Ubuntu:26.04:LTSangular.jsno fix listedUBUNTU-CVE-2026-88058
Ubuntu:26.10angular.jsno fix listedUBUNTU-CVE-2026-88058
npm@angular/platform-serverno fix listedGHSA-j3r3-mxqp-r2p4
npm@angular/platform-server20.3.30GHSA-j3r3-mxqp-r2p4
npm@angular/platform-server22.1.4GHSA-j3r3-mxqp-r2p4
npm@angular/platform-server21.2.22GHSA-j3r3-mxqp-r2p4

Affected products (as reported)

VendorProductVersions
angular angular <= 19.2.25>= 20.0.0, < 20.3.30>= 21.0.0, < 21.2.22>= 22.0.0, < 22.1.4

Weakness: CWE-79, CWE-116 · Vector: 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

References