OCTOBER 8, 2026
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Case File

CVE-2026-103321

HIGH · CVSS 8.3 EPSS 0.36% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-30 · Last synced 2026-10-08

CyberRota Analysis

AI-Generated

The vulnerability affects the MISP application, specifically the event graph preview feature, where an authenticated user can store a crafted image URL that lacks server-side validation. This allows an attacker to execute arbitrary JavaScript in the victim's browser, potentially leading to session hijacking, data theft, or unauthorized actions within the MISP application. Organizations using MISP versions prior to 2.5.48 should prioritize patching this vulnerability to mitigate the associated risks.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-103321
Severity
HIGH
CVSS
8.3
EPSS
0.36%
Java

Original NVD Description

MISP contains a stored cross-site script (XSS) vulnerability in the event graph preview feature. The event graph preview image field was accepted and stored without server-side validation. On the client side, the stored value was rendered into an HTML img element's src attribute via string concatenation, allowing a crafted value to break out of the attribute context and inject arbitrary script. Preconditions: - An authenticated MISP user with the ability to create or modify an event graph entry. - A second user (the victim) who views the event graph and triggers the preview popover. Impact: - Execution of arbitrary JavaScript in the victim's browser within the MISP application context. - Potential theft of session tokens, cookies, or sensitive data accessible to the victim's browser. - Potential for performing actions on behalf of the victim within the MISP application. Affected: MISP versions prior to the fix (commit applied after v2.5.48).