What is the CVSS score of CVE-2026-26101?

CVE-2026-26101 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-26101?

Within 24 hours: Identify all systems running Opds-Talon up to version 2.2.0.4 and isolate affected instances from production networks if possible. Within 7 days: Implement compensating controls (WAF rules, access restrictions) and establish continuous monitoring for suspicious access patterns. Within 30 days: Upgrade to version 2.2.0.5 or later when vendor patch becomes available, or evaluate alternative solutions if patch timeline is unacceptable.

Opds Talon CVE-2026-26101

HIGH

Incorrect Permission Assignment for Critical Resource (CWE-732)

2026-02-20 prodsec@nozominetworks.com

Privilege Escalation Opds Talon Owlcyberdefense

7.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

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

Access

Authenticate as low-privilege local user
Exploit

Send crafted network request to OPDS service
Execution

Bypass file permission checks
Impact

Modify or delete critical files with elevated privileges

Vulnerability Assessment

Weakness	CWE CWE-732 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V13 - Configuration Permission assignment review
Exploitation Conditions	Local user account access to Owl OPDS 2.2.0.4 server with OPDS network service enabled. Requires PR:L (authenticated local privilege) as indicated by CVSS vector. Affected by incorrect file permissions on critical resources that OPDS service can manipulate.
Impact	CVSS 7.8 (HIGH). Attack vector: Local. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via remote/network.
Exploit ScenarioDerived	A remote attacker could exploit this vulnerability to compromise the affected system.

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

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Opds-Talon versions up to 2.2.0.4 is affected by incorrect permission assignment for critical resource (CVSS 7.8).

RemediationAI

Monitor vendor advisories for a patch.

Affects your stack

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Technical ContextAI · show details

This vulnerability (CWE-732: Incorrect Permission Assignment for Critical Resource) affects Opds-Talon. Incorrect Permission Assignment for Critical Resource in Owl opds 2.2.0.4 allows File Manipulation via a crafted network request.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

Incorrect Permission Assignment for Critical Resource in Owl opds 2.2.0.4 allows File Manipulation via a crafted network request.

Executive ViewAI

Why It Matters

Opds-Talon versions through 2.2.0.4 contain a critical permission flaw that could allow unauthorized users to access sensitive resources. Organizations running affected versions face elevated risk of data breach or unauthorized system access until remediation is completed.

Business Impact: High

Compensating Controls

Implement network segmentation to restrict access to Opds-Talon instances; deploy WAF rules to enforce strict input validation and resource access controls; disable non-critical Opds-Talon features if possible; enforce multi-factor authentication for all Opds-Talon administrative access; implement enhanced logging and real-time alerting for unauthorized resource access attempts.

Threat Intelligence Overview

EPSS Score

0.0%

Top 98% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

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 No

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

Small

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +39

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.