CVE-2026-104906

Summary

MISP contains a cross-site scripting (XSS) vulnerability in the TAXII object viewer. When displaying a remote TAXII object, the JSON content of string properties was rendered directly into an HTML pre block without HTML-encoding. An attacker who can control or influence the content of a TAXII object (e.g., by publishing a malicious object to a TAXII server that the victim's MISP instance subscribes to) can inject arbitrary HTML or JavaScript that executes in the context of the victim's MISP session.

Preconditions:

• The victim must be an authenticated MISP user with access to the TAXII object viewer.

• The victim must open or view the crafted TAXII object.

Impact:

• Execution of arbitrary JavaScript in the victim's browser within the MISP application context.

• Potential theft of session tokens, API keys, or other sensitive data accessible from the MISP interface.

• Potential for performing actions on behalf of the authenticated user.

Affected versions: <2.5.48.

Affected Software

Weaknesses

• CWE-79: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/MISP/MISP/commit/1bed4ca0c

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