Is CVE-2026-49212 actively exploited?

No active exploitation of CVE-2026-49212 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-49212 be exploited remotely?

Yes. CVE-2026-49212 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-49212?

CVE-2026-49212 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-49212

HIGH

CVE-2026-49212

CWE-345Published: July 17, 2026· Updated: Jul 20, 2026

7.5

CVSS v3.1

EPSS:0.18%probability of exploitation in 30 daysPercentile:7.7th

Official Description

Symfony UX is a JavaScript ecosystem for Symfony. From 2.8.0 until 2.36.0 and 3.1.0, the HMAC computed by Symfony\UX\LiveComponent\LiveComponentHydrator covered only sorted prop key/value pairs and did not include the component name, the slot identifier (props vs propsFromParent), or request context, allowing a signed blob minted for one component or slot to be replayed in another and set a read-only prop on a target component. This issue is fixed in versions 2.36.0 and 3.1.0.

NVD Source

Technical Analysis

CVE-2026-49212 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.5.