Strapi: Schwachstelle ermöglicht Cross-Site Scripting
WID-SEC-2026-3324 · first 14.09.2026 · updated 14.09.2026 · CVSS 8,7
What it is about
Strapi ist ein headless Content-Management-System (CMS), dass als Open-Source-Software entwickelt wird. Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Strapi ausnutzen, um einen Cross-Site Scripting Angriff 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
- einen Cross-Site Scripting Angriff durchzuführen
Am I affected?
Affected according to the BSI:
- Open Source Strapi <5.48.1
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Open Source Strapi 5.48.1
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
- Original BSI advisory (WID)
- GitHub Advisory Database vom 2026-09-13 github.com
- EU Vulnerability Databse vom 2026-09-13 euvd.enisa.europa.eu
- GitHub Issue #26857 mit PoC github.com
CVE: CVE-2026-90561
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.