What is the CVSS score of EUVD-2026-78653?

EUVD-2026-78653 has a CVSS 4.0 base score of 5.3 (Medium). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. EPSS exploitation probability: 0.3%.

Is there a public PoC exploit available for EUVD-2026-78653?

Yes, a public proof-of-concept exploit is available for EUVD-2026-78653. Prioritise patching immediately. EPSS: 0.3%.

Is there a patch available for EUVD-2026-78653?

Yes, a patch is available for EUVD-2026-78653. Update the affected software to the latest version immediately.

Vikunja EUVD-2026-78653

| CVE-2026-91982 MEDIUM

Insufficiently Protected Credentials (CWE-522)

2026-09-15 VulnCheck

GHSA-88f6-4rjv-x774

GHSA-jmr8-r558-3jhx

Information Disclosure Vikunja Go Vikunja

5.3

CVSS 4.0 · Vendor: VulnCheck

View

Vulnerability Assessment

Weakness

CWE

CWE-522

OWASP Top 10:2025

A06:2025 - Insecure Design

ASVS 5.0

V6 - Authentication Credential protection in transit/storage

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.3% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Sep 15, 2026

Vikunja releases before 2.6.0 return the raw TOTP shared secret from the GET /api/v1/user/settings/totp and /api/v1/user/settings/totp/qrcode endpoints without demanding re-authentication, so anyone holding a valid access token can clone the victim's second factor. Because the exposed seed lets an attacker generate valid codes indefinitely, a hijacked session token can be converted into durable account takeover that survives password changes but not TOTP secret rotation. The vendor has shipped a fix in 2.6.0; no public exploit code or CISA KEV entry was identified at time of analysis.

Affected VersionsENISA

vikunja 0 <2.6.0

Affected Packages

go code.vikunja.io/api fix: 2.6.0

euvd vikunja fix: 2.6.0

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 2 packages in go, euvd

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

Know when Vikunja gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

Vendor (VulnCheck) PRIMARY 5.3 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck) · only source for this CVE.

CVSS VectorVendor: VulnCheck

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

Low

User Interaction

None

Vulnerable system: Confidentiality

Low

Vulnerable system: Integrity

None

Vulnerable system: Availability

None

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

Lifecycle Timeline

CVSS changed

Sep 15, 2026 - 16:22 NVD

4.3 (MEDIUM) 5.3 (MEDIUM)

Patch available

Sep 15, 2026 - 16:03 EUVD

DescriptionCVE.org

Vikunja before 2.6.0 continues to expose the raw TOTP shared secret after enrollment through the GET /api/v1/user/settings/totp and /api/v1/user/settings/totp/qrcode endpoints without re-authentication. Attackers with a valid access token can read the secret, import it into their own authenticator, and generate valid codes indefinitely to defeat the second factor and enable account takeover.

Threat Intelligence Overview

EPSS Score

0.3%

Top 80% exploitable

Threat Intel

1 source

Exploit

POC

Public exploit code exists

Data Quality

5 sources

Confidence: Medium

EUVD

NVD

CVE.org

EPSS GHSA

GitHub

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 MEDIUM

CISA KEV No

Public POC Yes

EPSS 0.3%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

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

Poc

System Exposure· derived

Open

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +26

PoC: +20

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.