CVE-2026-54359Network attack vector

Unauthorized data modification via disabled request-origin checks

Published Jun 12, 2026 · Updated Jun 12, 2026

Cross-site request forgery in MISP before 2.5.40 allows remote attackers to modify data through an authenticated user's browser. The Server.php setting Security.check_sec_fetch_site_header defaults to false, so POST, PUT, and AJAX requests are not rejected when Sec-Fetch-Site indicates a cross-site origin. Exploitation requires an authenticated user to visit an attacker-controlled page, and successful requests run with that user's privileges against automation endpoints.

CVSS severity7.1
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in MISP before 2.5.40 allows remote attackers to modify data through an authenticated user's browser. The Server.php setting Security.check_sec_fetch_site_header defaults to false, so POST, PUT, and AJAX requests are not rejected when Sec-Fetch-Site indicates a cross-site origin. Exploitation requires an authenticated user to visit an attacker-controlled page, and successful requests run with that user's privileges against automation endpoints.

The record

CVE
CVE-2026-54359
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
MISP Project
Product
MISP
Classifications
CWE-1188, CWE-352, CAPEC-62
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.5.40

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MISP Project · MISPversion=0 <2.5.40

Published CVSS scores

7.1CIRCLCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1188Insecure Default Initialization of Resource
CWE-352Cross-Site Request Forgery (CSRF)
CAPEC-62Cross Site Request Forgery

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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