Threat landscape
high

MISP: Mehrere Schwachstellen

WID-SEC-2026-3689 · first 01.10.2026 · updated 01.10.2026 · CVSS 8,3

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What it is about

MISP ist eine Open-Source-Plattform für den Informationsaustausch über Bedrohungen. Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in MISP ausnutzen, um seine Berechtigungen bis auf „Site-Administrator”-Ebene zu erweitern, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren oder offenzulegen sowie Cross-Site-Scripting-Angriffe durchzuführen.

Under what conditions?

Over the network, but only with valid access (login required), for example with stolen credentials or as an insider.

What can happen in the worst case

An attacker could use the vulnerability to

  • seine Berechtigungen bis auf „Site-Administrator”-Ebene zu erweitern
  • Sicherheitsmaßnahmen zu umgehen
  • Daten zu manipulieren oder offenzulegen sowie Cross-Site-Scripting-Angriffe durchzuführen

Am I affected?

Affected according to the BSI:

  • Open Source MISP <2.5.48

The installed version is usually shown under “Help → About” or in the device’s admin interface.

What helps?

Update to at least:

  • Open Source MISP 2.5.48

Is the vulnerability already being exploited?

None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.

Information and sources

CVE: CVE-2026-103235, CVE-2026-103237, CVE-2026-103239, CVE-2026-103321, CVE-2026-103388, CVE-2026-103389

Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.

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