CVE-2026-70650 GetSimple CMS - Stored XSS

GetSimple CMS CE <= 3.3.22 contains a stored XSS caused by improper re-encoding in the page backup viewer (admin/backup-edit.php), letting authenticated users execute JavaScript in admin browsers, exploit requires page edit privileges.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.26% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Stored XSS
Impact
Stored XSS
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
1 October 2026
Updated
15 October 2026
Weakness
CWE-79

Vendor fix

Update to the latest version once patches are available.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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