# CVE-2026-64972: Reflected XSS in ATutor

> Authenticated attackers can execute arbitrary scripts via reflected XSS in ATutor's preview.php, risking session hijacking or data theft.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 20 Aug 2026
- **Updated:** 20 Aug 2026
- **Also known as:** GHSA-2fm5-jp2h-3vgh

## What is CVE-2026-64972?

CVE-2026-64972 is a medium-severity cross-site scripting vulnerability in ATutor, published on 20 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

ATutor is vulnerable to Reflected XSS via popup parameter in preview.php. An authenticated attacker can inject a double quote into the popup parameter, break out of the attribute value, and append a new event handler such as onload. The related preview_top.php file sanitises these parameters, but that does not prevent XSS in the parent frameset rendered by preview.php itself.

Product is no longer actively supported and the vulnerabilities have not been fixed. Only version 2.2.4 was tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-64972?


## How do I fix CVE-2026-64972?

No fix has been published for CVE-2026-64972 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-64972 being exploited?

There is no known exploitation of CVE-2026-64972 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-64972 and fix it if it is affected.

What it is: CVE-2026-64972 is a medium-severity cross-site scripting vulnerability in ATutor, published on 20 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-64972 in the wild and no public exploit code.

Affected product: ATutor. 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-2026-64972/ (Markdown: https://insights.sbomify.com/CVE-2026-64972/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-64972
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-64972
- OSV: https://osv.dev/vulnerability/CVE-2026-64972

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-64972/
Summaries are generated and may contain mistakes; the official description above is the record.