CVE-2026-53953 GetSimple CMS - Authentication Bypass

GetSimple CMS CE 3.3.22 contains a broken authentication caused by predictable temporary password generation using PHP rand() seeded with microtime() in the password reset endpoint, letting attackers perform administrator account takeover, exploit requires no authentication but relies on timing attack.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.34% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
1 October 2026
Updated
15 October 2026
Weakness
CWE-338

Vendor fix

Update to the latest version when available or apply patches addressing password reset and rate limiting.

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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