CVE-2026-119764
Mythic 3.2.16 through 3.4.0.61 Stored XSS via Agent-Downloaded File Preview
CVSS Score
6.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | its-a-feature |
| Product | mythic |
| Published | Oct 30, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
its-a-feature / Mythic
3.2.16 ≤ 3.4.0.61
References
github.com: https://github.com/h00die/mythic_xss github.com: https://github.com/its-a-feature/Mythic/commit/f06b3ed2d1de6577744cc0b3146966c625685859 github.com: https://github.com/its-a-feature/Mythic/blob/33a46d7db7e237458d7e20e7d3cfefef8112e590/MythicReactUI/src/components/pages/Callbacks/ResponseDisplayMedia.js#L335-L336 github.com: https://github.com/its-a-feature/Mythic vulncheck.com: https://www.vulncheck.com/advisories/mythic-3.2.16-through-3.4.0.61-stored-xss-via-agent-downloaded-file-preview
Credits
h00die