foundation50 classroom50 Path Traversal Flaw (CVE-2026-94620) Rated CVSS 9.4
A newly published critical vulnerability in foundation50 classroom50 carries a CVSS score of 9.4. Here is what is affected and how to respond.
Key points
- CVE-2026-94620 affects foundation50 classroom50.
- CVSS 9.4 (Critical).
- No exploitation confirmed yet.
A critical path traversal tracked as CVE-2026-94620 has been published in the National Vulnerability Database for foundation50 classroom50, with a CVSS base score of 9.4.
At a glance
- CVE
- CVE-2026-94620
- Product
- foundation50 classroom50
- CVSS
- 9.4 Critical
- Weakness
- path traversal
- Exploited
- No known exploitation
What is the vulnerability?
The NVD entry states: Classroom 50 is a free and open-source tool for managing and grading programming assignments via GitHub. Prior to version 1.11.0, `gh teacher download` clones each student's assignment repository and then writes autograde artifacts (`result.json` and `results.json`) into the just-cloned working tree. The write followed symlinks, so a student who committed `result.json` or `results.json` as a **symlink** (materialized verbatim by `git clone`) could redirect the teacher's write to an arbitrary path — e.g. `~/.zshrc`, `~/.ssh/authorized_keys`, a cron file, or an in-clone `.git/hooks/*` file that git subsequently executes. The written bytes are attacker-controlled (the student's uploaded release asset for `result.json`; student-chosen submit-tag names for `results.json`). This is an arbitrary file write leading to code execution as the teacher, whose `gh` token carries `admin:org`, `repo`, a
Affected versions
| Vendor | Product | Versions |
|---|---|---|
| Foundation50 | classroom50 | < 1.11.0 |
Is it being exploited?
There is no public confirmation of exploitation at the time of publication. It does not appear in CISA's Known Exploited Vulnerabilities catalog. We will update this report if that changes.
What should you do?
- Identify whether the affected product and versions run in your environment.
- Apply the vendor update listed in the advisory as soon as it is available.
- Limit network exposure of the affected service until it is patched.
- Monitor the vendor advisory for updated guidance or exploitation reports.
What to do and how to stay safe: CVE-2026-94620
- Patch scores alone ignore context like network exposure and asset criticality.
- You must map vulnerabilities to specific business risks to prioritize correctly.
- Continuous exposure data replaces static scanning for accurate prioritization.
Prioritize vulnerabilities by actual exploitability and business impact, not by theoretical severity scores. Update your asset context and exposure data continuously to maintain accurate risk rankings.
Step-by-step guide: Risk Based Vulnerability Management: Prioritize Fixes by Actual Threat
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is CVE-2026-94620?
CVE-2026-94620 is a path traversal vulnerability in foundation50 classroom50.
How severe is CVE-2026-94620?
It has a CVSS score of 9.4 Critical.
Is CVE-2026-94620 being exploited?
There is no public confirmation of exploitation at the time of publication.
