# CVE-2025-14021: Security feature bypass in LINE client for iOS

> Attackers can spoof the address bar in the LINE iOS in-app browser to execute malicious JavaScript and conduct phishing attacks.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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:** 15 Dec 2025
- **Updated:** 15 Dec 2025
- **Also known as:** GHSA-h66v-gcx5-5fhw

## What is CVE-2025-14021?

CVE-2025-14021 is a medium-severity vulnerability in Linecorp Line, published on 15 Dec 2025. 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 in LINE client for iOS versions prior to 14.14 is vulnerable to address bar spoofing, which could allow attackers to execute malicious JavaScript within iframes while displaying trusted URLs, enabling phishing attacks through overlaid malicious content.

Weakness: CWE-451 (User Interface (UI) Misrepresentation of Critical Information)

## Which versions are affected by CVE-2025-14021?

It affects 1 product.


Products: Linecorp Line.

## How do I fix CVE-2025-14021?

No fix has been published for CVE-2025-14021 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-14021 being exploited?

There is no known exploitation of CVE-2025-14021 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-2025-14021 and fix it if it is affected.

What it is: CVE-2025-14021 is a medium-severity vulnerability in Linecorp Line, published on 15 Dec 2025. 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-2025-14021 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-2025-14021/ (Markdown: https://insights.sbomify.com/CVE-2025-14021/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-14021
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-14021
- OSV: https://osv.dev/vulnerability/CVE-2025-14021

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-14021/
Summaries are generated and may contain mistakes; the official description above is the record.