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

Quick assessment

Affected

its-a-feature Mythic

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mythic 3.2.16 至 3.4.0.61 版本存在一个存储型跨站脚本（Stored XSS）漏洞。攻击者若能控制目标端点上的文件，可通过在名为 .pdf 的文件中植入 HTML 内容，使 JavaScript 代码在 Mythic UI 的源域（origin）中执行。当操作员下载该文件并点击“预览媒体（Preview Media）”时，/direct/view 接口会因内容嗅探（content-sniffing）而将 HTML 作为同源内容渲染，从而窃取 localStorage 中存储的 JWT 令牌，导

CVSS 6.8 · Medium Updated Oct 31, 2026

Possible ATT&CK Techniques 2 AI

T1055.001 · Dynamic-link Library Injection T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

Vendor	Product	Version Range	Status
its-a-feature	Mythic	`3.2.16≤ 3.4.0.61`	affected

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Vulnerability Information

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Vulnerability Title

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

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
its-a-feature	Mythic	3.2.16 ~ 3.4.0.61	-

II. Public POCs for CVE-2026-119764

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-119764

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Other References for CVE-2026-119764 (5)

https://github.com/h00die/mythic_xss third-party-advisory
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/commit/f06b3ed2d1de6577744cc0b3146966c625685859 patch
https://github.com/its-a-feature/Mythic product
https://www.vulncheck.com/advisories/mythic-3.2.16-through-3.4.0.61-stored-xss-via-agent-downloaded-file-preview third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-119764

IV. Related Vulnerabilities

Same product: Mythic

Same vendor: its-a-feature

Same weakness: CWE-79