CVE-2026-95665: MISP reflected XSS in event REST search export confirmation form

CVE-2026-95665 · Severity: info · Published 2026-09-22

MISP, an open-source threat intelligence platform, contains a reflected cross-site scripting vulnerability in its event export feature. An unauthenticated attacker can craft a malicious URL that, when visited by an authenticated user, executes arbitrary JavaScript in the user's browser session. This could allow the attacker to hijack the user's session, steal sensitive data, or perform unauthorized actions within MISP.

Technologies: MISP Project MISP. Vendors: MISP Project.

Quick answers

Is CVE-2026-95665 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-95665 being exploited in the wild.
How severe is CVE-2026-95665?
Informational severity, published 22 September 2026.
Which products and versions are affected?
MISP Project MISP unspecified.
Is there a fix for CVE-2026-95665?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-95665 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2026-95665?
Check whether you run MISP Project MISP at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability exists in the event REST search export confirmation form (eventRestSearchExportConfirmationForm.ctp) where URL-supplied event IDs are rendered into a JavaScript string literal using PHP's json_encode() without hex-encoding flags. Since json_encode() does not escape single quotes by default, an attacker can inject a single quote to break out of the string literal and inject arbitrary JavaScript code. The attack requires an authenticated victim to click a malicious link, and affects the Default and UiBeta themes but not the Overmind theme which properly escapes the value.

Affected products

  • MISP Project MISP unspecified

Timeline

  • 2026-09-22: disclosed

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