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GHSA-jj27-h5hq-8x99
@angular/core@angular/core@angular/coreA 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.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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