Arbitrary file upload in Get-Simple Getsimple Cms
CVE-2018-19420
In GetSimpleCMS 3.3.15, admin/upload.php blocks .html uploads but there are several alternative cases in which HTML can be executed, such as a file with no extension or an unrecognized extension (e.g., the test or test.asdf filename), because of admin/upload-uploadify.php, and validate_safe_file in admin/inc/security_functions.php.
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.8 (Low). Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.008 (54.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Get-Simple Getsimple Cms — versions 3.3.15
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/GetSimpleCMS/GetSimpleCMS/issues/1301 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2018-19420?
- CVE-2018-19420 is a low-severity vulnerability in Get-Simple Getsimple Cms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 3.8/10. Published 2018-11-21.
- How severe is CVE-2018-19420?
- Low severity. CVSS v3 base score is 3.8 out of 10.
- Is CVE-2018-19420 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.