Angular i18n: Cross-Site Scripting (XSS) via event-handler attributes
A Cross-Site Scripting (XSS) vulnerability has been identified in the Angular compiler's internationalization (i18n) pipeline. Although Angular disallows binding to event-handler attributes such as onclick and onerror through standard attribute validation (validateAttribute() / validateProperty()), the i18n metadata collection path allowed these same attribute names to be marked for translation using i18n-on* attributes (e.g., i18n-onerror).
When exploited, a lower-trust translation file could replace a benign static handler such as onerror="void 0" with arbitrary executable JavaScript in the localized build.
The following example illustrates a vulnerable pattern:
<img src="foo.jpg" onerror="void 0" i18n-onerror />Impact
When exploited, this vulnerability allows arbitrary JavaScript execution within the context of the vulnerable application's domain if an attacker can control or influence the translation files used during localization. This can lead to:
- Session Hijacking: Accessing session cookies, tokens, or sensitive user data.
- Unauthorized Actions: Performing actions on behalf of the authenticated user.
Patched Versions
- 22.0.1
- 21.2.19
- 20.3.27
Workarounds
Ensure that static event-handler attributes (e.g., onerror, onclick) are never marked for internationalization (i18n-on*) in application templates, and ensure translation files are sourced from trusted origins.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @angular/compiler | >= 22.0.0-next.0, < 22.0.1, >= 21.0.0-next.0, < 21.2.19, >= 20.0.0-next.0, < 20.3.27, <= 19.2.25 | 22.0.1, 21.2.19, 20.3.27 |
| npm package | @angular/core | >= 22.0.0-next.0, < 22.0.1, >= 21.0.0-next.0, < 21.2.19, >= 20.0.0-next.0, < 20.3.27, <= 19.2.25 | 22.0.1, 21.2.19, 20.3.27 |
References
- https://github.com/angular/angular/security/advisories/GHSA-jj27-h5hq-8x99
- https://github.com/angular/angular/pull/68821
- https://github.com/angular/angular/pull/69306
- https://github.com/angular/angular/commit/417a4071a776464d549509ed3aec121dbd2fda5e
- https://github.com/angular/angular/commit/6c41f5ca01c0ae045fc7d929b72853a11eb55865
- https://github.com/angular/angular
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-79- Platform
- npm
- Package
@angular/compiler, @angular/core- Disclosed
- 03.08.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-jj27-h5hq-8x99 - CC BY 4.0
Vulnerability history: @angular/compiler
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 7
- First → latest
- 12.2025 09.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 4
- Medium 3
Disclosures per year
- 2025: 1
- 2026: 6
-
Angular i18n: Cross-Site Scripting (XSS) via event-handler attributes this entry
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