# CVE-2024-21504: Cross-site Scripting in livewire/livewire > An attacker can inject malicious HTML into a user's browser session via crafted links in Livewire applications using the Url property. - **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** A user has to click or open something - **Fix available:** Yes - **Published:** 19 Mar 2024 - **Updated:** 27 Aug 2024 - **Also known as:** GHSA-389c-cf87-qmwj ## What is CVE-2024-21504? CVE-2024-21504 is a medium-severity cross-site scripting vulnerability in livewire/livewire, published on 19 Mar 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. ### Official description Versions of the package livewire/livewire from 3.3.5 and before 3.4.9 are vulnerable to Cross-site Scripting (XSS) when a page uses [Url] for a property. An attacker can inject HTML code in the context of the user's browser session by crafting a malicious link and convincing the user to click on it. Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation) ## Which versions are affected by CVE-2024-21504? 2 open source packages ship an affected version, including livewire/livewire. It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `livewire/livewire` | Packagist | From 3.3.5 | 3.4.9 | | `livewire/livewire` | Packagist | From 3.3.5 | 3.4.9 | Products: Laravel Livewire. ## How do I fix CVE-2024-21504? Upgrade livewire/livewire to 3.4.9 or later. ## Is CVE-2024-21504 being exploited? It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-21504 exists. ## Other vulnerabilities in livewire/livewire - [CVE-2025-54068](https://insights.sbomify.com/CVE-2025-54068/): Laravel Livewire Code Injection (critical 9.2, exploited in the wild) - [CVE-2024-22859](https://insights.sbomify.com/CVE-2024-22859/): Cross-site request forgery in n/a (high 8.8) - [CVE-2024-47823](https://insights.sbomify.com/CVE-2024-47823/): Livewire Remote Code Execution (RCE) on File Uploads (high 7.7) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2024-21504 and fix it if it is affected. What it is: CVE-2024-21504 is a medium-severity cross-site scripting vulnerability in livewire/livewire, published on 19 Mar 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-21504 exists. Affected packages and fixed versions: - livewire/livewire (Packagist): affected from 3.3.5; fixed in 3.4.9 - livewire/livewire (Packagist): affected from 3.3.5; fixed in 3.4.9 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2024-21504/ (Markdown: https://insights.sbomify.com/CVE-2024-21504/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2024-21504 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-21504 - OSV: https://osv.dev/vulnerability/CVE-2024-21504 --- From sbomify Insights: https://insights.sbomify.com/CVE-2024-21504/ Summaries are generated and may contain mistakes; the official description above is the record.