CVE-2025-27416 Overview
CVE-2025-27416 affects the Scratch-Coding-Hut.github.io website, a community site for Coding Hut users. As of 28 February 2025, the sign-in page accepted Scratch usernames and passwords through a form that fails to properly authenticate users. Any account signing in through this form becomes accessible to other users of the same page. The maintainers acknowledged the flaw and confirmed a fix is in progress at the time of publication. This weakness is classified under [CWE-287: Improper Authentication].
Critical Impact
Any user submitting credentials through the Scratch-Coding-Hut sign-in form can have their account accessed by other users of the site.
Affected Products
- Scratch-Coding-Hut.github.io website (Coding Hut project site)
- Sign-in form present as of 28 February 2025
- Hosted on GitHub Pages under the Scratch-Coding-Hut organization
Discovery Timeline
- 2025-03-01 - CVE-2025-27416 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-27416
Vulnerability Analysis
The Scratch-Coding-Hut website exposed a sign-in form that requested a Scratch username and password. The form does not correctly bind an authenticated session to the submitting user. As a result, credentials or session state entered by one visitor become usable by another visitor of the same page. The maintainer advisory recommends avoiding the sign-in flow entirely until a patch ships. Full technical context is available in the GitHub Security Advisory and the associated GitHub Issue Discussion.
Root Cause
The root cause is improper authentication in a client-side sign-in form hosted on a static site. The form collects Scratch credentials without a secure server-side authentication boundary. Because the site is served from GitHub Pages, it lacks the trusted backend needed to isolate one user's authenticated state from another's. This design allows session or credential material submitted by one user to be observed or reused by other users.
Attack Vector
Exploitation requires only that a victim submit credentials through the vulnerable form. A second user visiting the site can then sign into the victim's Scratch account. The attack occurs over the network and requires user interaction from the victim. No privileges are required from the attacker. Public exploit code has not been released, and the flaw is not listed in the CISA Known Exploited Vulnerabilities catalog.
No verified proof-of-concept code has been published. See the GitHub Security Advisory for maintainer commentary.
Detection Methods for CVE-2025-27416
Indicators of Compromise
- Unexpected Scratch account activity following a visit to Scratch-Coding-Hut.github.io.
- Sign-in events on Scratch originating from IP addresses that do not match the account owner's usual location.
- Reports from users that their Scratch account was accessed after entering credentials on the Coding Hut site.
Detection Strategies
- Monitor outbound web proxy logs for user visits to Scratch-Coding-Hut.github.io and its sign-in page.
- Correlate visits to the affected site with subsequent Scratch account anomalies reported by users.
- Flag browser telemetry showing credential submissions to GitHub Pages hosted forms that request third-party service credentials.
Monitoring Recommendations
- Alert on DNS or HTTP requests to the affected domain from managed endpoints.
- Review Scratch account audit trails for accounts whose owners are known to use the Coding Hut community site.
- Track user-reported incidents involving account takeover after visiting Scratch-related community sites.
How to Mitigate CVE-2025-27416
Immediate Actions Required
- Do not sign in through the form on Scratch-Coding-Hut.github.io until a fix is released.
- Users who previously signed in should reset their Scratch account password immediately.
- Enable any available account recovery options on the associated Scratch account.
- Advise managed users to avoid entering credentials into third-party community sites that reuse Scratch credentials.
Patch Information
At the time of publication, no fix is available. The maintainers have confirmed that remediation work is underway. Track the GitHub Issue Discussion and the GitHub Security Advisory for updates.
Workarounds
- Avoid using the sign-in page on Scratch-Coding-Hut.github.io entirely.
- Sign in directly on the official Scratch website instead of any third-party form.
- Block access to the affected page at the web proxy or DNS layer for managed users while a fix is pending.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
