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[NEW] [high] Contao: Multiple Vulnerabilities

high
An attacker can exploit multiple vulnerabilities in Contao to bypass security measures, escalate privileges and potentially gain administrator rights, perform cross-site scripting attacks, disclose sensitive information, and manipulate data.

CSIRTS triage

What
Multiple vulnerabilities in Contao allow attackers to bypass security measures, escalate privileges to administrator, execute cross-site scripting, disclose sensitive information, and manipulate data.
Who is affected
All Contao CMS deployments are affected; privilege escalation to administrator is possible.
Urgency
High; privilege escalation to administrator combined with XSS and data manipulation requires urgent patching.
Action
Apply Contao security patches immediately to all instances.

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Details

Source
CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity
high
Published
2026-08-25
Exploitation
Not in CISA KEV at last sync
Language
Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2999

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