CVE-2026-91944

Medium

Description

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.

SeverityMedium

CVSS6.1

Exploit probability—

ProductUnclecode Crawl4ai

PublishedSep 15, 2026

First seenSep 15, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

unclecode crawl4ai0.9.3 or later

Vendor advisories

github.com/unclecode/crawl4ai/security/advisories/GHSA-m446-hp3q-qfxp

Affected products

Product	Affected versions	Fixed in
unclecode crawl4ai	v < 0.9.3	0.9.3

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