CVE WatchOct 2, 2026

CVE-2026-104907

MISP contains a cross-site scripting (XSS) vulnerability in the remote event preview page. When a linked (remote) MISP server is configured,

CVSS

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No CVSS

EPSS

0.4%

p28

KEV

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Exploit Today

0-100

Published: Oct 2, 2026 · Last modified: Oct 2, 2026 · CWE-79 · CWE-116

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-10-032026-10-21

Technical description

MISP contains a cross-site scripting (XSS) vulnerability in the remote event preview page. When a linked (remote) MISP server is configured, the event preview renders tag identifiers inside an inline JavaScript onclick attribute. The tag ID value was HTML-escaped but not sanitized for the JavaScript string context, meaning a malicious linked server could supply a tag ID containing characters (such as a single quote) that break out of the JavaScript string literal and inject arbitrary script. Preconditions: - A linked/remote MISP server is configured and connected to the local instance. - The linked server supplies a crafted tag ID in an event. - An authenticated user views the event preview and interacts with the affected tag element. Impact: - Arbitrary JavaScript execution in the context of the viewing user's browser session, potentially allowing session hijacking, data exfiltration, or unauthorized actions on behalf of the user. Affected versions: MISP prior to the fix commit (v2.5.48 or later, exact boundary unconfirmed).

Official references

github.comhttps://github.com/MISP/MISP/commit/70ad174dd

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