CVE-2026-91944CWE-79cross-site-scripting

CVE-2026-91944

Medium · published September 15, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
17.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
5.1 · 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
EPSS
0.00263 · 17.1th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-15T20:17Z
References (2)
https://github.com/unclecode/crawl4ai/security/advisories/GHSA-m446-hp3q-qfxp · [email protected]https://www.vulncheck.com/advisories/crawl4ai-before-0.9.3-dom-based-xss-via-playground-ui · [email protected]
EPSS history
Timeline
  • 17 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 15 SEP 15:18Z
    crawl4ai before 0.9.3 DOM-based XSS via Playground UI
    cvelistv5