Medium severity · published Sep 15, 2026
CVE-2026-91944
crawl4ai before 0.9.3 DOM-based XSS via Playground UI
6.1
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 18% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CR
crawl4ai · unclecode
before 0.9.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-91944
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-91944
github.com
https://github.com/unclecode/crawl4ai/security/advisories/GHSA-m446-hp3q-qfxp
www.vulncheck.com
https://www.vulncheck.com/advisories/crawl4ai-before-0.9.3-dom-based-xss-via-playground-ui
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