CVE-2021-28976
CVE-2021-28976 is a high-severity vulnerability in Get-simple Getsimplecms with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-434.
Key facts
- Severity: High (CVSS 3.x base score 7.2)
- CVSS v2: 6.5
- EPSS exploit prediction: 8% (94th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-434
- Affected product: Get-simple Getsimplecms
- Published:
- Last modified:
Description
Remote Code Execution vulnerability in GetSimpleCMS before 3.3.16 in admin/upload.php via phar filess.
Frequently asked questions
- What is CVE-2021-28976?
- Remote Code Execution vulnerability in GetSimpleCMS before 3.3.16 in admin/upload.php via phar filess.
- How severe is CVE-2021-28976?
- CVE-2021-28976 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-28976 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-28976?
- CVE-2021-28976 affects Get-simple Getsimplecms. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-28976?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-28976 published?
- CVE-2021-28976 was published on 2021-06-23 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:get-simple:getsimplecms:*:*:*:*:*:*:*:*
More vulnerabilities in Get-simple Getsimplecms
- CVE-2023-46042 — Critical (CVSS 9.8): An issue in GetSimpleCMS v.3.4.0a allows a remote attacker to execute arbitrary code via a crafted payload to the…
- CVE-2020-18191 — Critical (CVSS 9.1): GetSimpleCMS-3.3.15 is affected by directory traversal. Remote attackers are able to delete arbitrary files via…
- CVE-2013-10032 — High (CVSS 8.8): An authenticated remote code execution vulnerability exists in GetSimpleCMS version 3.2.1. The application’s…
- CVE-2021-47778 — High (CVSS 7.2): GetSimple CMS My SMTP Contact Plugin 1.1.2 contains a PHP code injection vulnerability. An authenticated administrator…
- CVE-2021-47830 — Medium (CVSS 6.5): GetSimple CMS My SMTP Contact Plugin 1.1.1 contains a cross-site request forgery (CSRF) vulnerability. Attackers can…
- CVE-2021-36601 — Medium (CVSS 6.1): GetSimpleCMS 3.3.16 contains a cross-site Scripting (XSS) vulnerability, where Function TSL does not filter check…
All CVEs affecting Get-simple Getsimplecms →
Other CWE-434 (Unrestricted Upload of File with Dangerous Type) vulnerabilities
- CVE-2026-48283 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Unrestricted Upload of File with Dangerous Type…
- CVE-2026-48276 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Unrestricted Upload of File with Dangerous Type…
- CVE-2026-57700 — Critical (CVSS 10.0): Unrestricted Upload of File with Dangerous Type vulnerability in Daan.Dev OMGF Pro allows Using Malicious Files. This…
- CVE-2025-69129 — Critical (CVSS 10.0): Unauthenticated Arbitrary File Upload in WordPress & WooCommerce Scraper Plugin, Import Data from Any Site <= 1.0.7…
- CVE-2026-40772 — Critical (CVSS 10.0): Unauthenticated Arbitrary File Upload in GeekyBot <= 1.2.2 versions.
- CVE-2026-40412 — Critical (CVSS 10.0): Unrestricted upload of file with dangerous type in Azure Orbital Spatio allows an unauthorized attacker to execute code…
Browse all CWE-434 (Unrestricted Upload of File with Dangerous Type) vulnerabilities →