CVE-2026-91944
crawl4ai before 0.9.3 DOM-based XSS via Playground UI
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
crawl4ai versions before 0.9.3 contain a DOM-based cross-site scripting vulnerability in the Playground UI where the forceHighlightElement() function assigns textContent back to innerHTML, re-parsing JSON responses as HTML. Attackers can inject malicious scripts through crawled page content like the page title to steal the operator's API token from sessionStorage and gain full server control.
| CWE | CWE-79 |
| Vendor | unclecode |
| Product | crawl4ai |
| Published | Sep 15, 2026 |
Stay Ahead of the Next One
Get instant alerts for unclecode crawl4ai
Be the first to know when new medium vulnerabilities affecting unclecode crawl4ai are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
unclecode / crawl4ai
0 < 0.9.3
References
Credits
🔍 e1codes