# CVE-2026-5643: Cyber-III Student-Management-System Admin Add Endpoint notice.php cross site scripting

> Remote attackers can execute arbitrary scripts via the admin notice endpoint, potentially compromising user accounts and session data.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 6 Apr 2026
- **Updated:** 6 Apr 2026
- **Also known as:** GHSA-fwhv-4w7x-fj6c

## What is CVE-2026-5643?

CVE-2026-5643 is a medium-severity cross-site scripting vulnerability in Cyber-III Student-Management-System, published on 6 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

A vulnerability was identified in Cyber-III Student-Management-System up to 1a938fa61e9f735078e9b291d2e6215b4942af3f. This impacts an unknown function of the file /admin/Add%20notice/notice.php of the component Admin Add Endpoint. Such manipulation of the argument $_SERVER['PHP_SELF'] leads to cross site scripting. It is possible to launch the attack remotely. The exploit is publicly available and might be used. This product takes the approach of rolling releases to provide continious delivery. Therefore, version details for affected and updated releases are not available. The project was informed of the problem early through an issue report but has not responded yet.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-5643?


## How do I fix CVE-2026-5643?

No fix has been published for CVE-2026-5643 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-5643 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5643 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-5643 and fix it if it is affected.

What it is: CVE-2026-5643 is a medium-severity cross-site scripting vulnerability in Cyber-III Student-Management-System, published on 6 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5643 exists.

Affected product: Cyber-III Student-Management-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-2026-5643/ (Markdown: https://insights.sbomify.com/CVE-2026-5643/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-5643
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5643
- OSV: https://osv.dev/vulnerability/CVE-2026-5643

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-5643/
Summaries are generated and may contain mistakes; the official description above is the record.