GHSA-g3hc-697w-wm82: livewire/livewire (CVE-2026-81887)

Package	Ecosystem	Affected	Fixed in
livewire/livewire	Packagist	>=3.0.0-beta.1, <3.8.3 \|\| >=4.0.0-beta.1, <4.3.4	3.8.3, 4.3.4

Machine-written summary

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

Livewire, the PHP full-stack framework, is vulnerable to DOM-based cross-site scripting in versions 3.0.0-beta.1 up to 3.8.2 and 4.0.0-beta.1 up to 4.3.3, caused by how certain client-side component state is handled. An unauthenticated attacker can run arbitrary JavaScript in the origin of an affected application, but only in specific scenarios and only if a user interacts with the attacker's content. The source says the issue does not bypass server-side authorisation. Upgrade to Livewire 3.8.3 or 4.3.4, which fix the problem; the source lists no workaround.

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

Score	Rating	CVSS	Vector	Source
5.1	Medium	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0068, the 53rd percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

10 Aug 2026, 23:31 UTC Published by the maintainers as a GitHub repository advisory
31 Oct 2026, 14:06 UTC First seen by agentprime
31 Oct 2026, 14:06 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.