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| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| craftcms/cms | composer | >= 3.0.0, <= 3.8.3 | 3.8.4 |
| craftcms/cms | composer | >= 4.0.0, <= 4.4.3 | 4.4.4 |
The vulnerability stems from JSON encoding that did not escape forward slashes (due to JSON_UNESCAPED_UNICODE). This allowed attackers to craft titles with </script> payloads, breaking out of JavaScript contexts. The commit removed JSON_UNESCAPED_UNICODE from all Json::encode calls, ensuring proper escaping. The affected functions directly handled user-controlled data (e.g., RSS feed titles) and passed it to Json::encode with unsafe flags, making them the root cause.
KEV Misses 88% of Exploited CVEs- Get the report