CVE-2026-28678
📋 TL;DR
DSA Study Hub's authentication system stored JSON Web Tokens in HTTP cookies without cryptographic protection, allowing attackers to read and potentially modify authentication tokens. This affects all users of vulnerable versions who log into the application. Attackers could impersonate users or escalate privileges.
💻 Affected Systems
- DSA Study Hub
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Full account takeover leading to unauthorized access to user data, privilege escalation to administrative functions, and potential data manipulation or exfiltration.
Likely Case
Session hijacking allowing attackers to impersonate legitimate users, access their study materials, and perform actions on their behalf.
If Mitigated
With proper cookie security controls, the risk is limited to token readability but not modification, reducing impact to information disclosure only.
🎯 Exploit Status
Exploitation requires access to HTTP cookies, which can be obtained through various web attacks like XSS or network interception.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Commit d527fba and later
Vendor Advisory: https://github.com/toxicbishop/DSA-with-tsx/security/advisories/GHSA-vmxr-562h-rcgg
Restart Required: Yes
Instructions:
1. Update to commit d527fba or later
2. Restart the application server
3. Force all users to re-authenticate to invalidate old tokens
🔧 Temporary Workarounds
Implement Secure Cookie Flags
allAdd HttpOnly, Secure, and SameSite flags to authentication cookies
Set-Cookie: token=<value>; HttpOnly; Secure; SameSite=Strict
Use HTTPS Only
allEnforce HTTPS for all application traffic to prevent network interception
Configure web server to redirect HTTP to HTTPS
Set HSTS headers
🧯 If You Can't Patch
- Implement network segmentation to isolate the application from untrusted networks
- Deploy a WAF with cookie protection rules and monitor for suspicious authentication patterns
🔍 How to Verify
Check if Vulnerable:
Inspect the Set-Cookie headers from the authentication endpoint - check if JWT tokens are sent without proper security flags or encryptionCheck Version:
git log --oneline | head -5Verify Fix Applied:
Verify that authentication cookies now include HttpOnly, Secure, and SameSite flags, and that JWT payloads are properly signed/encrypted📡 Detection & Monitoring
Log Indicators:
- Multiple authentication attempts from same token
- User sessions from unexpected locations/IPs
- Authentication failures followed by successful logins with same credentials
Network Indicators:
- Unencrypted authentication traffic
- Cookie values being transmitted in cleartext
- Missing security headers in HTTP responses
SIEM Query:
source="web_logs" AND (cookie="*eyJ*" OR Set-Cookie="*token=*") AND NOT (HttpOnly AND Secure)