## https://sploitus.com/exploit?id=26D03CA2-0535-5B67-9721-107A879FC751
# (CVE-2026-61511) โ Proof of Concept
> **Educational and defensive Proof of Concept (PoC)** for validating exposure to the vBulletin vulnerability **CVE-2026-61511** โ Unauthenticated Remote Code Execution.
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> **Community : https://t.me/thecodeb0ss**
## Overview
This repository provides a **defensive detection and validation proof of concept** for the vBulletin vulnerability **CVE-2026-61511**.
According to publicly available security research, **CVE-2026-61511** describes a critical eval injection vulnerability in vBulletin's template runtime that, under specific conditions, can result in **unauthenticated Remote Code Execution (RCE)**.
The objective of this project is to help:
- Security researchers
- Penetration testers
- Blue teams
- Incident responders
- System administrators
identify vulnerable vBulletin installations, reproduce the issue in authorized laboratory environments, and verify successful remediation after applying official security updates.
This repository is intended **strictly for educational, defensive, and authorized security research purposes**.
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## Vulnerability
| CVE | Description |
|------|-------------|
| **CVE-2026-61511** | vBulletin 5.x through 5.7.5 and 6.x through 6.2.1 contains an eval injection vulnerability in the `vB5_Template_Runtime::runMaths()` method within the template runtime that allows unauthenticated remote attackers to execute arbitrary PHP code by supplying crafted input through the `pagenav[pagenumber]` parameter. Attackers can exploit the insufficiently restrictive regex filter by using phpfuck-style encoding with permitted characters to inject and execute arbitrary PHP code via the unauthenticated `ajax/render` template route without any authentication. |
**CWE:** CWE-95 โ Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
**CVSS Score:** 9.3 (Critical)
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## Affected Versions
According to the public advisories, the following vBulletin versions are affected:
- vBulletin **5.0.0 โ 5.7.5**
- vBulletin **6.0.0 โ 6.2.1**
Users should upgrade to the latest patched release provided by vBulletin.
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## Repository Goals
This project is designed to assist defenders in:
- Validating exposure to CVE-2026-61511
- Detecting vulnerable vBulletin installations
- Verifying remediation after patching
- Reproducing the issue within isolated lab environments
- Supporting incident response and forensic investigations
- Improving technical understanding of the disclosed vulnerabilities
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## Features
- Defensive vulnerability validation
- Detection of affected vBulletin versions
- Research-oriented implementation
- Patch verification
- Lightweight detector / scanner
- Educational reference implementation
- Unauthenticated RCE validation
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# Screenshots
## Detector / Scanner
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## Technical Details
### Vulnerability Chain
1. **Entry Point:** Unauthenticated access to the `ajax/render` template route
2. **Parameter:** `pagenav[pagenumber]` containing crafted input
3. **Vulnerable Method:** `vB5_Template_Runtime::runMaths()`
4. **Bypass Technique:** PHPFuck-style encoding using permitted characters
5. **Impact:** Arbitrary PHP code execution
The vulnerability exists because the regex filter is insufficiently restrictive, allowing attackers to bypass the intended validation using PHPFuck-style encoding techniques.
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## Academic & Defensive Research Notice
This repository has been published solely for:
- Academic research
- Security education
- Defensive security validation
- Authorized penetration testing
- Incident response
- Patch verification
- Vulnerability assessment
The software must **only** be executed against:
- Systems you own, or
- Systems for which you have received explicit authorization.
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## Authorization Requirement
Unauthorized testing against systems that you do not own or administer may violate local laws, organizational policies, or international regulations.
The author **does not** encourage or support:
- Unauthorized access
- Internet-wide exploitation
- Mass scanning of third-party systems
- Malicious activity
- Abuse of vulnerable infrastructure
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## Responsible Usage
This repository demonstrates publicly disclosed vulnerability behavior for defensive validation and educational purposes only.
It is **not intended** to function as an offensive exploitation framework or to facilitate unauthorized access.
Users are expected to comply with all applicable laws, regulations, and responsible disclosure practices.
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## Tested Environment
The proof of concept was developed and validated in the following environment:
- **Operating System:** Microsoft Windows
- **Python Version:** **2.7.17**
Execution on other operating systems or Python versions may require minor modifications.
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## Mitigation
Administrators are strongly encouraged to:
- Upgrade vBulletin to an officially patched release (6.2.2 or later)
- Apply all available security updates
- Review authentication and web server logs
- Monitor for suspicious activity
- Deploy Web Application Firewall (WAF) protections
- Follow vBulletin security hardening recommendations
- Continuously monitor official vBulletin security advisories
### Patched Versions
- vBulletin **6.2.2** and later
- vBulletin **5.7.6** and later
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## References
- [Karma(In)Security Disclosure](https://karmainsecurity.com/)
- [SSD Secure Disclosure](https://ssd-disclosure.com/)
- [vBulletin 6.2.1, 6.2.0, 6.1.6 Security Announcement](https://forum.vbulletin.com/)
- [vBulletin 6.2.2 Release Notes](https://forum.vbulletin.com/)
- [CVE-2026-61511](https://nvd.nist.gov/vuln/detail/CVE-2026-61511)
**Credits:** Egidio Romano for discovering and disclosing this vulnerability.
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## Contact
**Telegram:** https://t.me/thecodeb0ss
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## License
This project is released for **educational and defensive security research**.
Users are solely responsible for ensuring that all testing is conducted with proper authorization and in accordance with applicable laws, regulations, and organizational policies.
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## Disclaimer
THE SOFTWARE IS PROVIDED **"AS IS"**, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
IN NO EVENT SHALL THE AUTHOR OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT, OR OTHERWISE, ARISING FROM, OUT OF, OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
By using this repository, you acknowledge that you are solely responsible for ensuring that your activities are authorized and comply with all applicable laws, regulations, and organizational policies.
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## Additional Notes
This vulnerability has been assigned the following identifiers:
- **CVE:** CVE-2026-61511
- **CWE:** CWE-95
- **CVSS:** 9.3 (Critical)
- **Attack Vector:** Network
- **Attack Complexity:** Low
- **Authentication:** None Required
- **Confidentiality Impact:** High
- **Integrity Impact:** High
- **Availability Impact:** High
The vulnerability affects both vBulletin 5.x and 6.x branches, making it particularly critical for all vBulletin administrators to take immediate action.
### Exploitation Vector