CVE-2026-49212General(symfony / ux)

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD 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.

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0.0/ 10 priority

Sources & remediation

Patch / fix

https://github.com/symfony/ux/commit/a224b5af3e2e33ee14ac71356ae0e0877900a81c

Vendor / third-party advisories

https://github.com/symfony/ux/security/advisories/GHSA-34w5-c283-j9fg

Other references

Weakness type (CWE)

CWE-345

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
General: 1 classified signal
1 total mentions across 1 day

Affected systems

Vendors

symfony

Products

1 version affected across 1 product

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

General

1100.0%

Referenced assets1 URL

By indicator

https://dailycve.com/symfony-ux-live-component-improper-verification-of-cryptographic-signature-cve-2026-49212-low-dc-jun2026-507/

Full discourse1 post

DailyCVE@dailycve91d
General
🔵 Symfony UX Live Component, Improper Verification of Cryptographic Signature, #CVE-2026-49212 (Low) -DC-Jun2026-507 https://dailycve.com/symfony-ux-live-component-improper-verification-of-cryptographic-signature-cve-2026-49212-low-dc-jun2026-507/
Post summary
A low‑severity CVE—CVE‑2026‑49212—regarding improper verification of a cryptographic signature in Symfony UX Live Component is announced, but the post lacks information on PoC, exploitation, or mitigation.
0000026
213 followersView on X

CPE platform detail2 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

2 of 2 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	symfony	ux	-	-	-
App	symfony	ux	3.0.0	-	-

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