XSS in Its-A-Feature Mythic
CVE-2026-119764
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/h00die/mythic_xss (third-party-advisory)
- github.com/its-a-feature/Mythic/commit/f06b3ed2d1de6577744cc0b3146966c625685859 (patch)
- github.com/its-a-feature/Mythic/blob/33a46d7db7e237458d7e20e7d3cfefef8112e590/M… (technical-description)
- github.com/its-a-feature/Mythic (product)
- www.vulncheck.com/advisories/mythic-3.2.16-through-3.4.0.61-stored-xss-via-agen… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-119764?
- CVE-2026-119764 is a medium-severity vulnerability in Its-A-Feature Mythic, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2026-10-30.
- How severe is CVE-2026-119764?
- Medium severity. CVSS v3 base score is 6.8 out of 10.