CVE-2026-81887
mediumpriority · track · 0EPSS 0.007 · 52 %ileDEUSEPSS · scored 2026-10-27
Livewire is a full-stack framework for Laravel. From 3.0.0-beta.1 until 3.8.3 and 4.3.4, the dot-notated query-string parser in js/plugins/history/index.js, including fromQueryString() and insertDotNotatedValueIntoData(), accepts the __proto__, constructor, and prototype path segments and creates inherited objects. Client-side state handlers then access effects.html, effects.js, effects.xjs, and effects.scripts without Object.prototype.hasOwnProperty.call(), allowing inherited attacker-controlled state to be treated as trusted effects. An unauthenticated attacker can craft a URL that, when opened by a user, executes arbitrary JavaScript in the affected application's origin. Exploitation requires user interaction and does not bypass server-side authorization or grant privileges beyond the affected user. This issue is fixed in versions 3.8.3 and 4.3.4.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1.2–5.1
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (3)
Products and version ranges known to be affected.
advisories (3)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-3105Livewire: Schwachstelle ermöglicht Cross-Site ScriptingDeutsch2026-08-31csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Livewire ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen.
- WID-SEC-W-2026-4047Snipe-IT: Mehrere SchwachstellenDeutsch2026-10-19csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Snipe-IT ausnutzen, um beliebigen Code auszuführen, erweiterte Berechtigungen zu erlangen, SQL-Injection durchzuführen, Cross-Site-Scripting-Angriffe zu starten, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren oder offenzulegen, einen Denial-of-Service-Zustand auszulösen oder nicht näher spezifizierte Auswirkungen zu verursachen.
- GHSA-g3hc-697w-wm82Livewire DOM-based cross-site scripting during client-side state handling2026-09-02ghsa · osvUS
### Impact In Livewire v3 (≤ 3.8.2) and v4 (≤ 4.3.3), a vulnerability allows unauthenticated attackers to execute arbitrary JavaScript in the origin of an affected application in specific scenarios. The issue stems from how certain client-side component state is handled. This vulnerability does not affect prior major versions. Exploitation requires user interaction, but does not require authentication or prior access to the application. The issue does not bypass server-side authorisation and grants an attacker no privileges beyond those the affected user already holds. ### Patches This issue has been patched in Livewire v3.8.3 and v4.3.4. All users are strongly encouraged to upgrade to these versions or later as soon as possible. ### Workarounds There is no known workaround at this time. Users are strongly advised to upgrade to a patched version immediately.
sources
Which sources assert this record, and when.
references (5) nvd
External citations — patches, advisories, analysis.
- https://github.com/livewire/livewire/commit/11ebe646f7e81dde2d714815da8b3019d058561e
- https://github.com/livewire/livewire/pull/10467
- https://github.com/livewire/livewire/releases/tag/v3.8.3
- https://github.com/livewire/livewire/releases/tag/v4.3.4
- https://github.com/livewire/livewire/security/advisories/GHSA-g3hc-697w-wm82
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