What is the CVSS score of CVE-2026-28678?

CVE-2026-28678 has a CVSS 3.1 base score of 8.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-28678?

Within 24 hours: Assess current DSA Study Hub deployment and confirm vulnerability presence; notify stakeholders of the risk. Within 7 days: Apply the available patch to server/routes/auth.js (commit d527fba or later) across all production and staging environments; conduct verification testing. Within 30 days: Review authentication logs for signs of compromise; reset credentials for high-privilege accounts; document remediation in change management system.

Dsa Study Hub CVE-2026-28678

HIGH

Missing Encryption of Sensitive Data (CWE-311)

2026-03-07 security-advisories@github.com

Information Disclosure Dsa Study Hub

8.1

CVSS 3.1 · GitHub Advisory

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Intercept unencrypted HTTP cookie containing JWT
Exploit

Decode JWT payload without cryptographic protection
Execution

Forge or modify authentication token
Impact

Gain unauthorized access to user account

Vulnerability Assessment

Weakness	CWE CWE-311 OWASP Top 10:2025 A06:2025 - Insecure Design ASVS 5.0 V14 - Data Protection Encryption of sensitive data
Exploitation Conditions	DSA Study Hub versions prior to commit d527fba with authentication tokens stored in HTTP cookies without encryption. Requires user interaction (UI:R) — victim must visit attacker-controlled site or network where cookies are visible to attacker.
Impact	CVSS 8.1 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: Required.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

DSA Study Hub stores JWT authentication tokens in unencrypted HTTP cookies, allowing attackers to extract and replay user credentials to gain unauthorized access to accounts. An unauthenticated remote attacker can intercept these tokens through network traffic analysis or client-side inspection to impersonate legitimate users. A patch is available in commit d527fba and should be applied immediately.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 8.1

RemediationAI

A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-311 (Missing Encryption of Sensitive Data). Affects Dsa Study Hub. DSA Study Hub is an interactive educational web application. Prior to commit d527fba, the user authentication system in server/routes/auth.js was found to be vulnerable to Insufficiently Protected Credentials. Authentication tokens (JWTs) were stored in HTTP cookies without cryptographic protection of the payload. This issue has been patched via commit d527fba.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 8.1 HIGH

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Patch released

Mar 11, 2026 - 17:35 nvd

Patch available

CVE Published

Mar 07, 2026 - 16:15 nvd

HIGH 8.1

DescriptionGitHub Advisory

DSA Study Hub is an interactive educational web application. Prior to commit d527fba, the user authentication system in server/routes/auth.js was found to be vulnerable to Insufficiently Protected Credentials. Authentication tokens (JWTs) were stored in HTTP cookies without cryptographic protection of the payload. This issue has been patched via commit d527fba.

Executive ViewAI

Why It Matters

DSA Study Hub's authentication system contains a credential protection vulnerability (CVE-2026-28678) that could allow attackers to compromise user accounts and access sensitive educational data. This affects all users of the application and requires immediate patching to prevent unauthorized access to student and instructor information.

Business Impact: High

Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score

0.0%

Top 91% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +40

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.