{"id":"CVE-2026-94620","title":"Classroom 50 is a free and open-source tool for managing and grading programming assignments via GitHub","summary":"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 (`res…","severity":"critical","cvss":9.4,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","cwe":["CWE-22","CWE-59"],"vendor":"foundation50","product":"classroom50","affected":["classroom50 < 1.11.0"],"published":"2026-10-01","updated":"2026-10-02","sourceUpdated":"2026-10-02T18:47:49.947","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-94620","references":[{"url":"https://github.com/foundation50/classroom50/commit/79112f33932d1b5c398a8801d97a8813d52d55ce","label":"security-advisories@github.com"},{"url":"https://github.com/foundation50/classroom50/security/advisories/GHSA-qx2g-vpwq-466c","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"epss":0.00415,"epssPercentile":0.3566,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-01T16:17:49.043303Z"},"cvssSource":"cna","ingestedAt":"2026-10-01T18:55:42.357Z","slug":"CVE-2026-94620","body":"## Overview\n\nClassroom 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`, and `workflow` across the entire classroom organization. Version 1.11.0 contains a patch. Some workarounds are available. Avoid running `gh teacher download` against untrusted student repositories, or run it inside a disposable sandbox / container with no access to sensitive host files or credentials. Inspect cloned trees for symlinked, hardlinked, or special (`result.json`/`results.json`) entries before allowing the artifact-refresh step to run.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":52,"depthScoreParts":{"impact":51.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}