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Advisory record · GHSA-34w5-c283-j9fg

symfony/ux-live-component: LiveComponentHydrator HMAC checksum lacks component and slot binding

CVSS 6.9 MediumEPSS 0.0024 · 15th percentile

Published by the GitHub Advisory Database at 19 Jun 2026, 19:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
symfony/ux-live-componentPackagist>=2.8.0, <2.36.0 || >=3.0.0, <3.1.02.36.0, 3.1.0
Identifiers
GHSA-34w5-c283-j9fg · CVE-2026-49212 · PKSA-wxdb-kw41-yhdy
Weakness (CWE)
CWE-345
Tags
Published
19 Jun 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Versions 2.8.0 up to but not including 2.36.0, and 3.0.0 up to but not including 3.1.0, of the Symfony LiveComponent package (symfony/ux-live-component) are affected. The HMAC on read-only props did not cover the component name or slot, so a signed value from one component could be replayed on another component or in the other slot. An attacker who can send requests to a LiveComponent could use this to set a read-only prop on a target component to a value they could otherwise only choose for a writable prop elsewhere. Upgrade to 2.36.0 or 3.1.0.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.9 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0024, the 15th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:58 UTC First seen by agentprime
  2. 31 Oct 2026, 13:58 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.