Improper Verification of Cryptographic Signature Affecting symfony/ux-live-component package, versions >=2.8.0, <2.36.0>=3.0.0, <3.1.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PHP-SYMFONYUXLIVECOMPONENT-17339266
- published15 Jun 2026
- disclosed29 May 2026
- creditHugo Alliaume
Introduced: 29 May 2026
CVE-2026-49212 (opens in a new tab)How to fix?
Upgrade symfony/ux-live-component to version 2.36.0, 3.1.0 or higher.
Overview
symfony/ux-live-component is a Live components for Symfony
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via insufficient context binding in HMAC protection for Live Component properties. An attacker can modify read-only properties of a target component by replaying HMAC-signed property blobs issued for another component or for a different slot. Because the HMAC generated by LiveComponentHydrator covers only the property names and values and omits the component identity and slot context, signed data intended for one component or purpose can be reused in another, allowing attacker-controlled writable properties to influence otherwise protected read-only properties.
Note: Exploitation requires the attacker to obtain a valid signed property blob from another component or slot with compatible property names.