TI-2026-39269 Aliases CVE-2026-54393 GHSA-4hg7-5g9q-5922

MISP Overmind theme stored XSS via unvalidated homepage setting

LOW 23CWE-79Published 2026-06-12 · Updated 2026-06-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: Active
Attack complexity: Low
Attack requirements: None
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

A stored cross-site scripting vulnerability exists in MISP when the Overmind theme is used. The setHomePage endpoint previously saved the user-controlled path value through setSettingInternal(), bypassing the normal setSetting() validation logic, including validate_homepage, which requires homepage paths to start with /. As a result, an authenticated user could store an arbitrary homepage value, including an XSS payload. The stored value was later rendered in app/View/News/index.ctp as the href attribute of the “Continue to homepage” link without HTML escaping. This could allow execution of attacker-controlled JavaScript in the browser context of the affected MISP instance when the crafted homepage link is rendered and interacted with. The issue is fixed by always persisting the homepage setting through setSetting(), ensuring validation and access checks are applied, and by HTML-escaping the homepage value before rendering it in the news view.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00377 31st 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-2026-54393
2026-10-03 Alias added: GHSA-4hg7-5g9q-5922
2026-10-24 EPSS moved to the 50th–90th percentile
2026-10-25 EPSS moved to the below the 50th percentile

References

Patch 1

https://github.com/MISP/MISP/commit/d4733ca5d2fcceb12abc72ec6069f2484e3b8ec2

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