CVE-2026-119764 Mythic 3.2.16 through 3.4.0.61 Stored XSS via Agent-Downloaded File Preview

High 7.4 Published 30 Oct 2026 Updated 5 Nov 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-119764?

CVE-2026-119764 is a high-severity vulnerability in its-a-feature Mythic, published on 30 Oct 2026.

Official description

Mythic 3.2.16 through 3.4.0.61 contains a stored cross-site scripting vulnerability that allows attackers controlling target endpoint files to run JavaScript in the Mythic UI origin by planting HTML in .pdf-named files. When an operator downloads the file and clicks Preview Media, content-sniffed HTML from /direct/view renders same-origin, stealing localStorage JWTs for full GraphQL and REST access.

Weakness: CWE-79

Which versions are affected by CVE-2026-119764?

How do I fix CVE-2026-119764?

No fix has been published for CVE-2026-119764 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-119764 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-119764 exists.

Sources

Also known as GHSA-m857-xf4f-qjf2.