# CVE-2026-13521: SourceCodester Class and Exam Timetabling System preview5.php sql injection

> Remote attackers can exploit SQL injection in preview5.php to read or modify database contents in the Class and Exam Timetabling System.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Jun 2026
- **Updated:** 29 Jun 2026
- **Also known as:** GHSA-v4wv-mxfx-4g64

## What is CVE-2026-13521?

CVE-2026-13521 is a medium-severity SQL injection vulnerability in SourceCodester Class and Exam Timetabling System, published on 29 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was identified in SourceCodester Class and Exam Timetabling System 1.0/5.php. Affected by this vulnerability is an unknown functionality of the file /preview5.php. Such manipulation of the argument course_year_section leads to sql injection. The attack may be performed from remote. The exploit is publicly available and might be used.

Weakness: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command), CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2026-13521?


## How do I fix CVE-2026-13521?

No fix has been published for CVE-2026-13521 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-13521 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-13521 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-13521 and fix it if it is affected.

What it is: CVE-2026-13521 is a medium-severity SQL injection vulnerability in SourceCodester Class and Exam Timetabling System, published on 29 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-13521 exists.

Affected product: SourceCodester Class and Exam Timetabling System. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-13521/ (Markdown: https://insights.sbomify.com/CVE-2026-13521/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-13521
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-13521
- OSV: https://osv.dev/vulnerability/CVE-2026-13521

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-13521/
Summaries are generated and may contain mistakes; the official description above is the record.