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A significant security vulnerability has been unearthed in the Angular runtime and compiler, potentially exposing thousands of web applications to Cross-Site Scripting (XSS) attacks. The flaw, tracked as CVE-2026-32635, carries a high-severity CVSS score of 8.6 and targets the framework’s internationalization (i18n) mechanism.
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Get free email alertsAngular is widely respected for its built-in security features, which automatically sanitize data to prevent malicious scripts from executing in a user’s browser. However, this newfound vulnerability creates a “blind spot” in that shield.
The issue occurs when a developer uses a security-sensitive attribute—such as href on an anchor tag or src on an image—and simultaneously marks that attribute for internationalization using the i18n- prefix. Researchers discovered that enabling i18n for these attributes effectively bypasses Angular’s sanitization logic.
As the technical report explains:
“Enabling internationalization for the sensitive attribute by adding i18n-<attribute> name bypasses Angular’s built-in sanitization mechanism, which when combined with a data binding to untrusted user-generated data can allow an attacker to inject a malicious script“.
When an attacker successfully exploits this flaw by binding a malicious URL (like javascript:alert(1)) to an internationalized attribute, they gain the ability to execute arbitrary code within the context of the application’s domain.
The consequences for users can be devastating:
- Session Hijacking: Attackers can steal sensitive session cookies and authentication tokens to take over user accounts.
- Data Exfiltration: Malicious scripts can capture and transmit private user data to attacker-controlled servers.
- Unauthorized Actions: The attacker can perform actions on behalf of the victim, such as changing passwords or making unauthorized purchases.
The vulnerability is not limited to just links. A wide array of attributes have been confirmed as vulnerable, including action, src, data, formaction, longdesc, and poster.
For an application to be at risk, three conditions must be met:
- The app must use a vulnerable version of Angular.
- Unsanitized user input must be bound to one of the sensitive attributes.
- That specific attribute must be marked for internationalization.
The Angular team has moved quickly to address the issue, releasing patches across several major versions.
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Patched Versions: 22.0.0-next.3, 21.2.4, 20.3.18, and 19.2.20.
Immediate Security Actions:
- Update Now: Developers should upgrade to the latest patched version of Angular immediately.
- Sanitize Manually: If you cannot update right away, use Angular’s
DomSanitizerto explicitly clean any data before binding it to attributes. - Avoid Untrusted Input: Ensure that data bound to internationalized attributes is never sourced directly from untrusted user input, such as URL parameters or third-party APIs.
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