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CVE-2026-49212

Symfony UX: LiveComponentHydrator HMAC checksum lacks component and slot binding

Published: Jul 17, 2026Updated: Jul 20, 2026 Sources: CVE List NVDCWE-345
7.5HIGH
NVD MITRE
EPSS Score
0.2%
Top 94.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-345

Affected Products

symfony
oss-projectaka twig (related), symfony framework
uxLibrary
OSS Libraries / web-framework

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
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References

https://github.com/symfony/ux/security/advisories/GHSA-34w5-c283-j9fg
github.com
https://github.com/symfony/ux/commit/a224b5af3e2e33ee14ac71356ae0e0877900a81c
github.com
https://github.com/symfony/ux/releases/tag/v2.36.0
github.com
and 1 more references View all →

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