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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
Active
User action required
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 5
https://github.com/h00die/mythic_xss
disclosure@vulncheck.com
https://github.com/its-a-feature/Mythic
disclosure@vulncheck.com
https://github.com/its-a-feature/Mythic/blob/33a46d7db7e237458d7e20e7d3cfefef81…
disclosure@vulncheck.com
https://github.com/its-a-feature/Mythic/commit/f06b3ed2d1de6577744cc0b3146966c6…
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/mythic-3.2.16-through-3.4.0.61-stored-xss-…
disclosure@vulncheck.com