CVE-2026-35047

Critical

Published: 06 April 2026

Published

06 April 2026

Modified

10 April 2026

KEV Added

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Patch

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CVSS Score v4 9.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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

EPSS Score 0.0055 41.9th percentile

Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-35047 is a critical-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in Ajax30 Bravecms. Its CVSS base score is 9.3 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 41.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2026-35047 is an unrestricted file upload vulnerability affecting Brave CMS, an open-source content management system, in versions prior to 2.0.6. The flaw resides in the CKEditor endpoint, which permits attackers to upload arbitrary files, including executable scripts. This issue, classified under CWE-434 (Unrestricted Upload of File with Dangerous Type), carries a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating critical severity due to its potential for remote code execution (RCE) on the server.

The vulnerability can be exploited remotely by unauthenticated attackers with no privileges or user interaction required. By sending a malicious file upload request to the affected CKEditor endpoint, an attacker can upload executable scripts, leading to RCE. Successful exploitation may result in full server compromise, data exfiltration, or service disruption, impacting all users running vulnerable versions of BraveCMS.

Mitigation is available through the patch released in BraveCMS version 2.0.6. The GitHub security advisory (GHSA-9rcc-w59j-965v), associated pull request (#122), and fixing commit (058ee4ed7c2b39d540af8274024afcbc9532aa83) detail the resolution, recommending immediate upgrades for all affected installations.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-19392

Vulnerability details

Brave CMS is an open-source CMS. Prior to 2.0.6, an Unrestricted File Upload vulnerability in the CKEditor endpoint allows attackers to upload arbitrary files, including executable scripts. This may lead to Remote Code Execution (RCE) on the server, potentially resulting…

in full system compromise, data exfiltration, or service disruption. All users running affected versions of BraveCMS are impacted. This vulnerability is fixed in 2.0.6.

CWE(s): CWE-434

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1505.003 Web Shell Persistence

Adversaries may backdoor web servers with web shells to establish persistent access to systems.

attack.mitre.org →

Why these techniques?

CVE enables exploitation of public-facing web application (T1190) via unrestricted file upload in CKEditor endpoint, allowing unauthenticated RCE through executable script upload, directly facilitating web shell deployment (T1100).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0