CVE-2026-66824
Stored XSS in capture-tree visualization enabling session abuse and data theft.
Is CVE-2026-66824 being exploited?
Not confirmed. CVE-2026-66824 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.28% probability of exploitation in the next 30 days.
How severe is CVE-2026-66824?
CVE-2026-66824 is rated Critical with a CVSS score of 9.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-66824?
Yes. A fix has been recorded for CVE-2026-66824. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-66824 affect?
CVE-2026-66824 affects Web applications using the capture tree visualization component, Apps embedding serialized capture tree in inline JS, Authenticated users' browsers. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-66824?
Apply vendor patch immediately; sanitize capture data and enable CSP.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Stored XSS allows execution of arbitrary JavaScript in victim browsers to hijack sessions, exfiltrate data, or modify app data within user privileges.
Immediate action required
- affected<= 1.40.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.