CVE-2025-56139
📋 TL;DR
The LinkedIn Android app fails to update link preview metadata when users replace URLs before posting, causing the displayed preview to show stale information while the actual link points elsewhere. This allows attackers to create deceptive posts with trusted-looking previews that lead to malicious sites, primarily affecting LinkedIn users on Android devices.
💻 Affected Systems
- LinkedIn Mobile Application for Android
📦 What is this software?
Linkedin by Linkedin
⚠️ Risk & Real-World Impact
Worst Case
Widespread phishing campaigns where attackers impersonate legitimate organizations, steal credentials, distribute malware, or conduct financial fraud through deceptive LinkedIn posts.
Likely Case
Targeted phishing attacks where attackers trick users into clicking malicious links by displaying previews of legitimate websites, potentially leading to credential theft or malware installation.
If Mitigated
Users remain cautious about clicking links even with trusted previews, limiting successful attacks to less security-aware individuals.
🎯 Exploit Status
Exploitation requires creating LinkedIn posts/comments and social engineering users to click links. No authentication bypass needed beyond normal posting capabilities.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to latest version from Google Play Store
Vendor Advisory: https://hdhrmi.blogspot.com/2025/07/aiman-al-hadhrami-linkedin-vulnerability.html
Restart Required: No
Instructions:
Open Google Play Store
Search for LinkedIn
Tap Update if available
Alternatively, uninstall and reinstall the app
🔧 Temporary Workarounds
Disable automatic link previews
allManually verify URLs before clicking by checking the actual URL text rather than relying on preview images/titles
Use web version temporarily
allAccess LinkedIn through mobile browser instead of the vulnerable app
🧯 If You Can't Patch
- Educate users to hover/check URLs before clicking any LinkedIn links
- Implement network filtering to block known malicious domains
🔍 How to Verify
Check if Vulnerable:
Check app version in Android Settings > Apps > LinkedIn > App infoCheck Version:
adb shell dumpsys package com.linkedin.android | grep versionNameVerify Fix Applied:
Confirm app version is newer than 4.1.1087.2 and test by creating a post with URL replacement📡 Detection & Monitoring
Log Indicators:
- Unusual posting patterns from accounts
- Multiple users reporting deceptive links
Network Indicators:
- Outbound connections to suspicious domains from LinkedIn app
SIEM Query:
source="linkedin_app" AND (url_contains="phishing" OR url_contains="malicious")