CVE-2026-94620Network attack vectorHinoki check available

Teacher-context code execution via symlink-following artifact writes

Published Oct 1, 2026 · Updated Oct 1, 2026

Arbitrary file write in The Fifty Foundation Classroom 50 before 1.11.0 allows remote attackers to execute code on a teacher's host. The gh teacher download command clones a student repository, then writes result.json and results.json with os.WriteFile, which follows student-committed symlinks outside the clone. Exploitation requires an enrolled student to control an assignment repository and a teacher to run the download command; the resulting write executes in the teacher's context.

CVSS severity9.4
Critical
EPSS probability0.41%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Arbitrary file write in The Fifty Foundation Classroom 50 before 1.11.0 allows remote attackers to execute code on a teacher's host. The gh teacher download command clones a student repository, then writes result.json and results.json with os.WriteFile, which follows student-committed symlinks outside the clone. Exploitation requires an enrolled student to control an assignment repository and a teacher to run the download command; the resulting write executes in the teacher's context.

The record

CVE
CVE-2026-94620
Published
Oct 1, 2026
Updated
Oct 1, 2026
Vendor
The Fifty Foundation
Product
Classroom 50
Classifications
CWE-22, CWE-59, T1204.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.11.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Fifty Foundation · Classroom 50version=< 1.11.0

Published CVSS scores

9.4GitHub Security AdvisoryCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-59Improper Link Resolution Before File Access ('Link Following')
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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