EUVD-2026-78801
GHSA-hr2f-r8c5-ggxp
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from Vendor (VulnCheck) · only source for this CVE.
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
A DOM-based cross-site scripting flaw in the Crawl4AI Playground UI (versions before 0.9.3) lets attacker-controlled crawled content — for example a malicious page title — be re-parsed as HTML inside the forceHighlightElement() routine, which writes textContent back into innerHTML. Because the Playground stores the operator's API token in sessionStorage, a successful payload can read that token and hand an attacker full control of the underlying Crawl4AI server. …
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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