CVE-2025-4006: Unrestricted Upload in youyiio BeyongCms
A vulnerability classified as critical has been found in youyiio BeyongCms 1.6.0. Affected is an unknown function of the file /admin/theme/Upload.html of the component Document Management Page. The manipulation of the argument File leads to unrestricted upload. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.
AI Analysis
Technical Summary
CVE-2025-4006 is a vulnerability identified in youyiio BeyongCms version 1.6.0, specifically within the /admin/theme/Upload.html file of the Document Management Page component. The vulnerability arises from improper validation of the 'File' argument, allowing an attacker to perform an unrestricted file upload. This means that an attacker can remotely upload arbitrary files, potentially including malicious scripts or executables, without authentication or user interaction. The vulnerability is remotely exploitable and has been publicly disclosed, although no known exploits have been reported in the wild yet. The CVSS 4.0 score is 5.1 (medium severity), with the vector indicating network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:H - which actually indicates high privileges required, but the description suggests remote unauthenticated upload, so there may be some discrepancy), no user interaction (UI:N), and low impact on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). This suggests that while the vulnerability allows file upload, the impact on system confidentiality, integrity, and availability is limited or requires additional conditions to escalate. The lack of patches currently available increases the risk for organizations using this CMS version. The unrestricted upload could be leveraged to deploy web shells or malware, enabling further compromise of the affected systems.
Potential Impact
For European organizations using BeyongCms 1.6.0, this vulnerability poses a risk of unauthorized remote code execution or persistent backdoor installation via malicious file uploads. This could lead to data breaches, defacement, or service disruption. Given the CMS's role in document management, sensitive corporate or customer data could be exposed or manipulated. The medium CVSS score suggests limited immediate impact, but the unrestricted upload capability could be chained with other vulnerabilities or misconfigurations to escalate privileges or cause significant damage. Organizations in sectors with high regulatory requirements (e.g., finance, healthcare, government) could face compliance violations and reputational damage if exploited. The absence of known exploits in the wild currently reduces immediate threat but the public disclosure increases the risk of future exploitation attempts.
Mitigation Recommendations
1. Immediate mitigation should include restricting access to the /admin/theme/Upload.html endpoint via network controls such as IP whitelisting or VPN access to limit exposure. 2. Implement web application firewall (WAF) rules to detect and block suspicious file upload patterns or payloads targeting this endpoint. 3. Conduct thorough input validation and sanitization on the server side to restrict allowed file types, sizes, and content. 4. Monitor server logs for unusual upload activity or unexpected file creations in web directories. 5. If possible, upgrade to a newer, patched version of BeyongCms once available or apply vendor-provided patches promptly. 6. Employ file integrity monitoring to detect unauthorized changes to web-accessible directories. 7. Use least privilege principles for CMS administrative accounts to reduce the impact if credentials are compromised. 8. Consider isolating the CMS environment using containerization or sandboxing to limit lateral movement in case of compromise.
Affected Countries
Germany, France, United Kingdom, Italy, Spain, Netherlands, Poland, Belgium, Sweden, Austria
CVE-2025-4006: Unrestricted Upload in youyiio BeyongCms
Description
A vulnerability classified as critical has been found in youyiio BeyongCms 1.6.0. Affected is an unknown function of the file /admin/theme/Upload.html of the component Document Management Page. The manipulation of the argument File leads to unrestricted upload. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.
AI-Powered Analysis
Technical Analysis
CVE-2025-4006 is a vulnerability identified in youyiio BeyongCms version 1.6.0, specifically within the /admin/theme/Upload.html file of the Document Management Page component. The vulnerability arises from improper validation of the 'File' argument, allowing an attacker to perform an unrestricted file upload. This means that an attacker can remotely upload arbitrary files, potentially including malicious scripts or executables, without authentication or user interaction. The vulnerability is remotely exploitable and has been publicly disclosed, although no known exploits have been reported in the wild yet. The CVSS 4.0 score is 5.1 (medium severity), with the vector indicating network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:H - which actually indicates high privileges required, but the description suggests remote unauthenticated upload, so there may be some discrepancy), no user interaction (UI:N), and low impact on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). This suggests that while the vulnerability allows file upload, the impact on system confidentiality, integrity, and availability is limited or requires additional conditions to escalate. The lack of patches currently available increases the risk for organizations using this CMS version. The unrestricted upload could be leveraged to deploy web shells or malware, enabling further compromise of the affected systems.
Potential Impact
For European organizations using BeyongCms 1.6.0, this vulnerability poses a risk of unauthorized remote code execution or persistent backdoor installation via malicious file uploads. This could lead to data breaches, defacement, or service disruption. Given the CMS's role in document management, sensitive corporate or customer data could be exposed or manipulated. The medium CVSS score suggests limited immediate impact, but the unrestricted upload capability could be chained with other vulnerabilities or misconfigurations to escalate privileges or cause significant damage. Organizations in sectors with high regulatory requirements (e.g., finance, healthcare, government) could face compliance violations and reputational damage if exploited. The absence of known exploits in the wild currently reduces immediate threat but the public disclosure increases the risk of future exploitation attempts.
Mitigation Recommendations
1. Immediate mitigation should include restricting access to the /admin/theme/Upload.html endpoint via network controls such as IP whitelisting or VPN access to limit exposure. 2. Implement web application firewall (WAF) rules to detect and block suspicious file upload patterns or payloads targeting this endpoint. 3. Conduct thorough input validation and sanitization on the server side to restrict allowed file types, sizes, and content. 4. Monitor server logs for unusual upload activity or unexpected file creations in web directories. 5. If possible, upgrade to a newer, patched version of BeyongCms once available or apply vendor-provided patches promptly. 6. Employ file integrity monitoring to detect unauthorized changes to web-accessible directories. 7. Use least privilege principles for CMS administrative accounts to reduce the impact if credentials are compromised. 8. Consider isolating the CMS environment using containerization or sandboxing to limit lateral movement in case of compromise.
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Technical Details
- Data Version
- 5.1
- Assigner Short Name
- VulDB
- Date Reserved
- 2025-04-26T09:16:12.146Z
- Cisa Enriched
- true
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 682d983ec4522896dcbef963
Added to database: 5/21/2025, 9:09:18 AM
Last enriched: 6/24/2025, 6:07:57 PM
Last updated: 7/31/2025, 12:11:25 PM
Views: 10
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