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CVE-2026-90957— MISP: Stored XSS via Inline-Served SVG Organisation Logos and Report Pictures

Quick assessment

Affected
MISP MISP
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.

以下是该漏洞描述的中文翻译： 受影响的 MISP 版本会以内联方式提供上传的 SVG 图像，且未应用严格的浏览器沙箱限制。 提交记录指出，SVG 文件本质上是 XML 文档，而非被动的位图图像。当 SVG 通过普通的 标签渲染时，其中的脚本不会执行；但当直接访问该 SVG 文件或将其作为文档嵌入时，脚本则可能执行。在这种情况下，恶意的 元素、事件处理程序或 URL 将基于查看者的会话，在 MISP 源（origin）上执行。 受影响的用例包括： 机构（Organization）的 SVG 徽标； 事件报告（Even

CVSS 5.1 · Medium

Possible ATT&CK Techniques 2 AI

T1189.001 T1189.002
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I. Basic Information for CVE-2026-90957

Vulnerability Information
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Vulnerability Title
MISP: Stored XSS via Inline-Served SVG Organisation Logos and Report Pictures
Source: CVE Program / CVE List V5
Vulnerability Description
Affected versions of MISP serve uploaded SVG images inline without a restrictive browser sandbox. The commit explains that SVG files are XML documents rather than passive bitmap images. While scripts inside SVG do not execute when the SVG is rendered through a normal <img>, they can execute when the SVG is navigated to directly or embedded as a document. In that case, malicious <script> elements, event handlers, or javascript: URLs execute on the MISP origin with the viewer’s session. The affected use cases include:  - organisation SVG logos;  - event-report SVG pictures. Importantly, the vulnerable behavior is on the serve path, not merely the upload path: the patch notes that a malicious SVG uploaded while SVG support was enabled could remain dangerous even after uploads were later disabled. Version affected: ≤2.5.45
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA: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
MISP MISP 0 ~ 2.5.46 -

II. Public POCs for CVE-2026-90957

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III. Intelligence Information for CVE-2026-90957

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Patches & Fixes for CVE-2026-90957 (1)

Same Patch Batch · MISP · 2026-09-14 · 5 CVEs total

CVE-2026-90961 9.3 CRITICAL MISP LdapAuth and LinOTPAuth Authentication Bypass via Empty or Non-String Credentials
CVE-2026-90895 8.4 HIGH MISP Interactive CLI Shell: Authorization Bypass, Credential Exposure, and Terminal Inject
CVE-2026-90893 5.1 MEDIUM MISP UserSettingsController CSRF Protection Bypass on setTheme, setHomePage, and eventInde
CVE-2026-90955 4.6 MEDIUM MISP CLI Shell Audit Logs Lose User Identity and CLI Marker After First Lazy Model Load

IV. Related Vulnerabilities

Same product: MISP
Same vendor: MISP
Same weakness: CWE-79

V. Comments for CVE-2026-90957

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