CVE-2026-28495
CSRF-based RCE in GetSimple CMS massiveAdmin plugin.
Is CVE-2026-28495 being exploited?
Not confirmed. CVE-2026-28495 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.29% probability of exploitation in the next 30 days.
How severe is CVE-2026-28495?
CVE-2026-28495 is rated Critical with a CVSS score of 9.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-28495?
Yes. A fix has been recorded for CVE-2026-28495. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-28495 affect?
CVE-2026-28495 affects GetSimple CMS, massiveAdmin plugin v6.0.3, GetSimpleCMS-CE v3.3.22. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-28495?
Upgrade when patched; enforce CSRF protections; restrict admin access.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
CSRF against a logged-in admin can overwrite gsconfig.php, enabling remote code execution on the web server.
Immediate action required
- affected<= 3.3.22
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.