How severe is CVE-2021-47736?

CVE-2021-47736 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-2021-47736 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-47736?

CVE-2021-47736 affects Cmsimple-xh Cmsimple Xh. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-47736?

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.

Does CVE-2021-47736 have an EU (EUVD) identifier?

Yes. CVE-2021-47736 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204838.

When was CVE-2021-47736 published?

CVE-2021-47736 was published on 2025-12-23 and last updated on 2026-06-17.

CVE-2021-47736

CVE-2021-47736 is a high-severity vulnerability in Cmsimple-xh Cmsimple Xh 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-94.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v4: 8.6
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-204838
Weakness: CWE-94
Affected product: Cmsimple-xh Cmsimple Xh
Published: 2025-12-23
Last modified: 2026-06-17

Description

CMSimple_XH 1.7.4 contains an authenticated remote code execution vulnerability in the content editing functionality that allows administrative users to upload malicious PHP files. Attackers with valid credentials can exploit the CSRF token mechanism to create a PHP shell file that enables arbitrary command execution on the server.

Frequently asked questions

What is CVE-2021-47736?: CMSimple_XH 1.7.4 contains an authenticated remote code execution vulnerability in the content editing functionality that allows administrative users to upload malicious PHP files. Attackers with valid credentials can exploit the CSRF token mechanism to create a PHP shell file that enables arbitrary command execution on the server.
How severe is CVE-2021-47736?: CVE-2021-47736 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-2021-47736 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-47736?: CVE-2021-47736 affects Cmsimple-xh Cmsimple Xh. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-47736?: 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.
Does CVE-2021-47736 have an EU (EUVD) identifier?: Yes. CVE-2021-47736 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204838.
When was CVE-2021-47736 published?: CVE-2021-47736 was published on 2025-12-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cmsimple-xh:cmsimple_xh:1.7.4:-:*:*:*:*:*:*

More vulnerabilities in Cmsimple-xh Cmsimple Xh

CVE-2021-42645 — Critical (CVSS 10.0): CMSimple_XH 1.7.4 is affected by a remote code execution (RCE) vulnerability. To exploit this vulnerability, an…
CVE-2025-63589 — High (CVSS 7.1): A reflected XSS vulnerability exists in CMSimple_XH 1.8's index.php router when attacker-controlled path segments are…
CVE-2025-63588 — High (CVSS 7.1): An unauthenticated reflected cross-site scripting vulnerability in the query handling of CMSimpleXH allows remote…
CVE-2024-34452 — Medium (CVSS 6.1): CMSimple_XH 1.7.6 allows XSS by uploading a crafted SVG document.

All CVEs affecting Cmsimple-xh Cmsimple Xh →

Other CWE-94 (Code Injection) vulnerabilities

CVE-2026-57624 — Critical (CVSS 10.0): Unauthenticated Remote Code Execution (RCE) in Blocksy Companion Pro <= 2.1.46 versions.
CVE-2026-10134 — Critical (CVSS 10.0): IBM Langflow OSS 1.0.0 through 1.9.3 allows an attacker to read every secret available to the Langflow process, read…
CVE-2026-53576 — Critical (CVSS 10.0): Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, the authentication filter…
CVE-2026-10561 — Critical (CVSS 10.0): IBM Langflow OSS 1.0.0 through 1.9.3 has an vulnerability due to an improper isolation of Python execution combined…
CVE-2026-25470 — Critical (CVSS 10.0): Improper Control of Generation of Code ('Code Injection') vulnerability in ACPT ACPT (Pro) - Custom Post Types Plugin…
CVE-2026-48836 — Critical (CVSS 10.0): Unauthenticated Remote Code Execution (RCE) in Easy Invoice <= 2.1.19 versions.

Browse all CWE-94 (Code Injection) vulnerabilities →