CVE-2024-5739
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedThe 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceUniversal XSS (UXSS) vulnerability in the in-app browser of LINE for iOS allows a malicious iframe embedded in any website to execute arbitrary JavaScript in the top frame, bypassing same-origin policy. Successful exploitation enables attackers to capture or alter displayed content and steal user session information.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data>= 14.0.0, < 14.9.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check installed LINE for iOS versionOpen the LINE app, tap Settings (gear icon), scroll down and tap About LINE, then view the Version number displayedAffected if Version shown is 14.0.0, 14.1.0, 14.2.0, 14.3.0, 14.4.0, 14.5.0, 14.6.0, 14.7.0, or 14.8.x (any version from 14.0.0 up to but not including 14.9.0)
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Verify version via iOS SettingsOpen iOS Settings app, scroll down to find LINE in the app list, tap it, and view the version informationAffected if Displayed version matches 14.0.0 through 14.8.x
A user is affected if they have LINE for iOS installed with any version from 14.0.0 up to but not including 14.9.0, as this range contains the vulnerable in-app browser component.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped14.9.0
Update LINE client for iOS to version 14.9.0 or higher. Users should avoid clicking on untrusted URLs in LINE chats until the app is updated.
LINE iOS 14.9.0
- Open the App Store on the iOS device
- Search for "LINE" or open the LINE app
- Update LINE to version 14.9.0 or higher
- Alternatively, enable auto-updates for LINE in the App Store settings to ensure future security updates are applied automatically
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2024-5739 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-5739 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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