# CVE-2024-5739: Cross-site scripting in LINE client for iOS

> Attacker can execute arbitrary JavaScript in the LINE iOS in-app browser to steal session data or alter content via a malicious iframe.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **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:** No
- **Published:** 12 Jun 2024
- **Updated:** 28 Mar 2025
- **Also known as:** GHSA-9hrm-g973-phrr

## What is CVE-2024-5739?

CVE-2024-5739 is a medium-severity cross-site scripting vulnerability in Linecorp Line, published on 12 Jun 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

The in-app browser of LINE client for iOS versions below 14.9.0 contains a Universal XSS (UXSS) vulnerability. This vulnerability allows for cross-site scripting (XSS) where arbitrary JavaScript can be executed in the top frame from an embedded iframe on any displayed web site within the in-app browser. The in-app browser is usually opened by tapping on URLs contained in chat messages, and for the attack to be successful, the victim must trigger a click event on a malicious iframe. If an iframe embedded in any website can be controlled by an attacker, this vulnerability could be exploited to capture or alter content displayed in the top frame, as well as user session information. This vulnerability affects LINE client for iOS versions below 14.9.0 and does not affect other LINE clients such as LINE client for Android. Please update LINE client for iOS to version 14.9.0 or higher.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2024-5739?

It affects 1 product.


Products: Linecorp Line.

## How do I fix CVE-2024-5739?

No fix has been published for CVE-2024-5739 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-5739 being exploited?

There is no known exploitation of CVE-2024-5739 in the wild and no public exploit code.

## Other vulnerabilities in Linecorp Line

- [CVE-2023-45559](https://insights.sbomify.com/CVE-2023-45559/): Information disclosure in n/a (high 8.2)
- [CVE-2023-43305](https://insights.sbomify.com/CVE-2023-43305/): Information disclosure in n/a (high 8.2)
- [CVE-2023-43300](https://insights.sbomify.com/CVE-2023-43300/): Information disclosure in n/a (high 8.2)
- [CVE-2023-43301](https://insights.sbomify.com/CVE-2023-43301/): Code injection in n/a (high 8.2)
- [CVE-2023-43302](https://insights.sbomify.com/CVE-2023-43302/): Information disclosure in n/a (high 8.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-5739 and fix it if it is affected.

What it is: CVE-2024-5739 is a medium-severity cross-site scripting vulnerability in Linecorp Line, published on 12 Jun 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: There is no known exploitation of CVE-2024-5739 in the wild and no public exploit code.

Affected product: Linecorp Line. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2024-5739/ (Markdown: https://insights.sbomify.com/CVE-2024-5739/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-5739
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-5739
- OSV: https://osv.dev/vulnerability/CVE-2024-5739

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-5739/
Summaries are generated and may contain mistakes; the official description above is the record.