# CVE-2026-5813: PHPGurukul Online Course Registration SQL injection in check_availability.php

Source: https://junglewise.ai/threats/cve-2026-5813-phpgurukul-online-course-registration-sql-injection-in-check  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-08. Updated: 2026-07-24  
License: CC BY 4.0 with a link back

CVE-2026-5813 · Severity: high · CVSS 7.3 · Published 2026-04-08

PHPGurukul Online Course Registration is a web application used to manage student enrollments and course data. A security vulnerability in the system allows remote attackers to interfere with the underlying database without needing a username or password. This could lead to the theft of sensitive student information, unauthorized modification of records, or disruption of the registration service.

Technologies: [Phpgurukul Online Course Registration](https://junglewise.ai/threats/technologies/online-course-registration). Vendors: [Phpgurukul](https://junglewise.ai/threats/vendors/phpgurukul).

## Quick answers

**Is CVE-2026-5813 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-5813 being exploited in the wild.

**How severe is CVE-2026-5813?** High severity, with a CVSS score of 7.3, published 8 April 2026.

**Which products and versions are affected?** Phpgurukul Online Course Registration 3.1.

**Is there a fix for CVE-2026-5813?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-5813 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-5813?** Check whether you run Phpgurukul Online Course Registration at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A SQL injection vulnerability exists in PHPGurukul Online Course Registration 3.1 within the '/check_availability.php' file. The root cause is the failure to sanitize or validate user-supplied input for the 'cid' parameter before it is used in a database query. An unauthenticated remote attacker can exploit this by sending a specially crafted POST request containing malicious SQL commands. Successful exploitation allows for boolean-based and time-based blind SQL injection, enabling the attacker to extract database contents, modify data, or potentially gain administrative access. A public proof-of-concept (PoC) using sqlmap has been disclosed.

## Affected products

- PHPGurukul Online Course Registration 3.1

## Timeline

- 2026-03-25: disclosed: Initial disclosure on GitHub by researcher f1rstb100d
- 2026-04-08: advisory: NVD/VulDB advisory published

## References

- [https://github.com/f1rstb100d/CVE/issues/20](https://github.com/f1rstb100d/CVE/issues/20)
- [https://phpgurukul.com/](https://phpgurukul.com/)
- [https://vuldb.com/submit/787686](https://vuldb.com/submit/787686)
- [https://vuldb.com/vuln/356261](https://vuldb.com/vuln/356261)
- [https://vuldb.com/vuln/356261/cti](https://vuldb.com/vuln/356261/cti)

## Related threats

- [PHPGurukul Online Course Registration SQL injection in check_availability.php](https://junglewise.ai/threats/cve-2026-5814-phpgurukul-online-course-registration-sql-injection-in-check)
- [A flaw has been found in PHPGurukul Online Course Registration up to 3.1. This affects an unknown function. This…](https://junglewise.ai/threats/cve-2025-15406-a-flaw-has-been-found-in-phpgurukul-online-course-registration-up)
- [PHPGurukul Online Course Registration Session Hijacking in change-password.php](https://junglewise.ai/threats/cve-2025-50485-phpgurukul-online-course-registration-session-hijacking-in-change)