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The vulnerability stems from the unescaped inclusion of the redirect parameter in the registration link URL within the login.phtml template. The commit diff explicitly shows the addition of $this->escapeUrl() to sanitize the parameter, confirming that the absence of this escaping mechanism in versions <1.2.2 allowed XSS. The vulnerable code directly outputs user-controlled input ($this->redirect) without sanitization, making the template's URL construction logic the root cause.
| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| zf-commons/zfc-user | composer | < 1.2.2 | 1.2.2 |