{"id":"CVE-2026-49208","title":"ux-live-component: Format-less date LiveProps parsed with the permissive DateTime constructor","summary":"ux-live-component: Format-less date LiveProps parsed with the permissive DateTime constructor","severity":"medium","cwe":["CWE-20"],"vendor":"symfony","product":"symfony/ux-live-component","affected":["symfony/ux-live-component >= 2.8.0, < 2.36.0","symfony/ux-live-component >= 3.0.0, < 3.1.0"],"patched":["symfony/ux-live-component 2.36.0","symfony/ux-live-component 3.1.0"],"published":"2026-06-19","updated":"2026-06-19","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-89g7-22c8-3j23","references":[{"url":"https://github.com/symfony/ux/security/advisories/GHSA-89g7-22c8-3j23"},{"url":"https://github.com/symfony/ux/commit/d24d78fda6df2d5964312255943ebf3a217b79a2"},{"url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/ux-live-component/CVE-2026-49208.yaml"},{"url":"https://github.com/advisories/GHSA-89g7-22c8-3j23"}],"tags":["ghsa","composer"],"ingestedAt":"2026-06-22T15:52:21.071Z","ecosystem":"composer","epss":0.00412,"epssPercentile":0.35165,"slug":"CVE-2026-49208","body":"## Overview\n\n### Description\n\nWhen a `#[LiveProp]` is typed as a `DateTimeInterface` and no explicit `format` is configured, `Symfony\\UX\\LiveComponent\\LiveComponentHydrator::hydrateObjectValue()` falls back to `new $className($value)`. The `DateTime` / `DateTimeImmutable` constructors accept relative strings such as `\"now\"`, `\"tomorrow\"`, or `\"+10 years\"`, so a writable, format-less date prop can be pushed to an arbitrary point in time by the client. Components that rely on a date prop to gate time-based business logic can be moved past those checks by a frontend payload that no maintainer would consider a valid date.\n\n### Resolution\n\n`hydrateObjectValue()` now parses format-less date props strictly with `createFromFormat(DateTimeInterface::RFC3339, ...)`, matching the format already emitted by `dehydrateObjectValue()`. Normal round-trips are unaffected; only inputs that aren't valid RFC 3339 are now rejected, which is consistent with how a format-configured prop already behaved.\n\nThe patch for this issue is available [here](https://github.com/symfony/ux/commit/d24d78fda6df2d5964312255943ebf3a217b79a2) for branch 2.x (and forward-ported to 3.x).\n\n### Credits\n\nSymfony would like to thank Pascal Cescon for reporting the issue and Hugo Alliaume for providing the fix.\n\n## Affected packages\n\n- `symfony/ux-live-component >= 2.8.0, < 2.36.0`\n- `symfony/ux-live-component >= 3.0.0, < 3.1.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `symfony/ux-live-component 2.36.0`\n- `symfony/ux-live-component 3.1.0`","depth":"sunlit","depthScore":28,"depthScoreParts":{"impact":27.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}