CVE•Published 2026-05-29•Modified 2026-05-29•1 article on news•6 live references•NVD data
CVE-2026-9558
Vulnerability data via NVD (ingested)
CVSS v3.1
9.9
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS percentile
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Description
A Server-Side Template Injection (SSTI) vulnerability exists in Mautic's theme engine. The platform renders uploaded Twig templates without a sandbox or strict function restrictions. Authenticated users with permissions to create or upload themes can abuse this to execute arbitrary code on the hosting server (Remote Code Execution) or access restricted system files and configuration settings.
Timeline
Published 2026-05-29
Modified 2026-05-29
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
More intel sources (5)
Shodan report
vuln:CVE-2026-9558Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-9558Censys host search filtered to this CVE id.
grep.app
CVE-2026-9558Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-9558GitHub code search for direct mentions.
Google dork
"CVE-2026-9558" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.