CVE•Published 2026-09-08•Modified 2026-09-09•0 articles on news•3 live references•NVD data

CVE-2026-54611

Vulnerability data via NVD (ingested)

CVSS v3.1

5.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H

EPSS percentile

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Weaknesses (CWE)

CWE-94Improper Control of Generation of Code ('Code Injection')CWE-434Unrestricted Upload of File with Dangerous Type

Description

InstantCMS is a free and open source content management system. Versions prior to 2.18.2 have a Remote Code Execution (RCE) issue that allows remote authenticated attackers to execute any PHP code via the component installer. It is possible to upload a malicious component into the server, however, it won't be installed, but upload files will be executed. Normally all php files in upload folder are not executed, however, by uploading custom .htaccess it becomes possible. Version 2.18.2 contains a fix.

Timeline

Published 2026-09-08

Modified 2026-09-09

External references

NVD MITRE VulnCheck

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).

Shodan · vuln tag0 hosts

vuln:CVE-2026-54611

Hosts Shodan has explicitly fingerprinted as vulnerable.

More intel sources (5)

Shodan report

vuln:CVE-2026-54611

Country / ASN / product breakdown for the vuln query.

Censys

vulnerabilities.cve_id: CVE-2026-54611

Censys host search filtered to this CVE id.

grep.app

CVE-2026-54611