TI-2026-39274 Aliases CVE-2026-54398 GHSA-27wx-pvwm-cfh2

MISP object edit authorization bypass allows unauthorized sharing group assignment

LOW 23CWE-863Published 2026-06-12 · Updated 2026-06-15

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

An authorization flaw in MISP’s object add/edit handling allowed an authenticated user with object editing permissions to assign a MISP object, or attributes contained within an object, to a sharing group that the user was not authorized to use or view. When editing objects, the sharing group validation was performed against the wrong request data structure after object fields had been merged to the top level, causing the check to be bypassed. In addition, attributes embedded in objects were not individually validated for authorized sharing group use. An attacker could craft a request with distribution set to 4 and an arbitrary sharing_group_id, potentially disclosing the existence or name of otherwise non-visible sharing groups and improperly modifying the distribution metadata of objects or contained attributes.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0022 12th percentileScored 2026-11-07

Fix Fixed misp (misp): 2.5.40

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
MISP	misp	before 2.5.40	2.5.40	Patch available	CNA

misp VendorMISP Affected before 2.5.40 Fixed in 2.5.40 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:misp-project:misp::::::::	—	—	Misp-project

cpe:2.3:a:misp-project:misp:*:*:*:*:*:*:*:* Versions — — ·Misp-project

Remediation

Fix · CNA misp (misp) Fixed in 2.5.40

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-06-12
misp 2.5.40
12 records Highest priority Priority MEDIUM 1 MEDIUM, 11 LOW
Other records, highest priority first
- TI-2026-39253 MISP mass assignment vulnerabilities allow unauthorized modification of ownership and delegation recordsPriority MEDIUM 44
- TI-2026-39252 MISP sharing group creation mass assignment allows unauthorized takeover of existing sharing groupsPriority LOW 36
- TI-2026-39251 MISP automation endpoints may be exposed to CSRF when Sec-Fetch-Site protection is disabled by defaultPriority LOW 36
Show all 12 records →

Timeline

2026-10-02 Threatist record created from CVE-2026-54398
2026-10-03 Alias added: GHSA-27wx-pvwm-cfh2

References

Patch 1

https://github.com/MISP/MISP/commit/4fe48c523e66999d65f99fdec9508adb3aa1c0f3

TI-2025-41517 In MISP before 2.5.28, app/View/Elements/Workflows/executionPath.ctp allows XSS in the workflow execution path. CVSS 3.1CRITICAL 9.0
TI-2026-65744 MISP TOTP Code Replay Allows Duplicate Authentication Within Validity Period CVSS 4.0CRITICAL 9.3
TI-2026-54145 Path Traversal in MISP Object Template Resolution During STIX Import and Export in misp-stix library CVSS 4.0HIGH 8.8
TI-2020-10250 MISP MISP-maltego 1.4.4 incorrectly shares a MISP connection across users in a remote-transform use case. CVSS 3.1CRITICAL 9.8
TI-2026-59159 MISP Unauthenticated Mail Endpoints Allow Unbounded Storage Consumption and Request Flooding CVSS 4.0HIGH 8.7
TI-2026-58541 MISP LDAP and LinOTP Authentication Bypass via Empty or Invalid Credentials CVSS 4.0CRITICAL 9.5

See all 182 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences