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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| its-a-feature | Mythic | 3.2.16 – ≤ 3.4.0.61 | — |
References
- https://github.com/h00die/mythic_xss third-party-advisory
- https://github.com/its-a-feature/Mythic/commit/f06b3ed2d1de6577744cc0b3146966c625685859 patch
- https://github.com/its-a-feature/Mythic/blob/33a46d7db7e237458d7e20e7d3cfefef8112e590/MythicReactUI/src/components/pages/Callbacks/ResponseDisplayMedia.js#L335-L336 technical-description
- https://github.com/its-a-feature/Mythic product
- VulnCheck Advisory: Mythic 3.2.16 through 3.4.0.61 Stored XSS via Agent-Downloaded File Preview third-party-advisory