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CVE-2026-91944

crawl4ai before 0.9.3 DOM-based XSS via Playground UI

CVSS 4.0 5.1 MEDIUMCVSS 3.1 6.1 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-91944

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-91944

Published

crawl4ai

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "unclecode",
                    "product": "crawl4ai",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:pypi/crawl4ai",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "0.9.3"
                        },
                        {
                            "version": "0.9.3",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON