What is the CVSS score of CVE-2026-91859?

CVE-2026-91859 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:N/VI:L/VA:N/SC:N/SI:N/SA:N. EPSS exploitation probability: 0.5%.

Is there a patch available for CVE-2026-91859?

Yes, a patch is available for CVE-2026-91859. Update the affected software to the latest version immediately.

Misp CVE-2026-91859

EUVD-2026-78350 MEDIUM

Insufficient Logging (CWE-778)

2026-09-15 CIRCL

GHSA-qx5f-75hg-mf2c

Information Disclosure Misp

5.3

CVSS 4.0 · Vendor: CIRCL

View

Vulnerability Assessment

Weakness

CWE

CWE-778

OWASP Top 10:2025

A09:2025 - Security Logging & Alerting Failures

ASVS 5.0

V16 - Security Logging and Error Handling Sufficient logging implementation

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

Patch available 0.5% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 15, 2026

MISP 2.5.45 and earlier can write corrupted access-log records for any HTTP request that ends in an unhandled exception, because CakePHP's CakeErrorController extends AppController and re-runs the application startup path, causing AccessLog::logRequest() to register a second deferred writer that overwrites the row written by the first pass. The overwritten fields include request duration, SQL query count, memory usage and potentially the query log, silently degrading the fidelity of MISP's own audit trail. Exploitation requires an authenticated session (CVSS 4.0 PR:L, VI:L only); no public exploit code or CISA KEV listing was identified at time of analysis, and an upstream fix commit (0dae5c072) is available.

Affected VersionsENISA

MISP 0 <2.5.46

Affected Packages

euvd misp fix: 2.5.46

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (CIRCL) PRIMARY 5.3 MEDIUM

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

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

CVSS VectorVendor: CIRCL

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

Low

User Interaction

None

Vulnerable system: Confidentiality

None

Vulnerable system: Integrity

Low

Vulnerable system: Availability

None

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

DescriptionCVE.org

Affected versions of MISP can record incorrect access-log data for requests that terminate in an exception.

Because CakeErrorController extends AppController, exception rendering runs the application startup path a second time. As a result, __accessMonitor() calls AccessLog::logRequest() twice for one HTTP request. The second deferred writer measures the error-controller execution instead of the original request and can overwrite the row created by the first pass. The corrupted fields include request duration, SQL query count, memory usage, and potentially the recorded query log.

The bug was masked because the same model instance retained the ID of the first saved row, causing the later save to issue an UPDATE rather than insert an obvious duplicate row.

Version affected: ≤2.5.45

Threat Intelligence Overview

EPSS Score

0.5%

Top 60% exploitable

Data Quality

6 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

Vulnrichment

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 No

EPSS 0.5%

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

None

System Exposure· derived

Open

Automatable

Human Impact· derived

Medium

Technical Impact

Partial

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +26

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.