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CVE-2026-85236

8.8, high

misp Cross-Site Request Forgery Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
8.8, high high CVSS v3.1
EPSS, next 30 days
0.3% higher than 15.5% of scored CVEs
Exploitation
No public evidence
Published
3 Sept 2026a month ago

Description

A cross-site request forgery (CSRF) vulnerability existed in the cullEmptyEvents action of MISP. The endpoint performed a state-changing and irreversible operation while accepting HTTP GET requests. Because bodyless GET requests are not subject to CakePHP's CSRF validation, an attacker could cause an authenticated MISP user with sufficient privileges to invoke the endpoint simply by causing their browser to load a crafted URL, for example through an embedded image or other automatically requested resource. Successful exploitation triggers the deletion of published empty events. The deletion is particularly significant because the operation uses skipBlocklist, meaning the removed events do not leave blocklist entries that could prevent or track their subsequent synchronization. This can result in unintended and potentially irreversible deletion of MISP event records without explicit user interaction. The vulnerability was addressed by restricting cullEmptyEvents to HTTP POST requests, ensuring that CakePHP's normal CSRF protections are applied to the operation.

Details

Vendor
Misp
Product
misp
Weakness
CWE-352 (opens in a new tab)
Status
Analyzed
Updated
11 Sept 2026
Assigner
5a6e4751-2f3f-4070-9419-94fb35b644e8

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References 5

Patches and fixes 5

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Misp CVEs

Every Misp CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-86419 MISP Exposure of Sensitive Information Vulnerability EPSS 0.4% 9.1, critical
  • CVE-2026-86452 MISP Uncontrolled Resource Consumption Vulnerability EPSS 0.5% 7.5, high
  • CVE-2026-85216 MISP contains an authentication bypass vulnerability in its LDAP and LinOTP authentication components due to insufficient validation of… EPSS 0.9% 9.8, critical
  • CVE-2026-85221 MISP contains an improper TLS certificate validation vulnerability in CurlClient EPSS 0.3% 9.1, critical
  • CVE-2026-85237 A vulnerability in MISP's email-based one-time password (OTP) authentication flow allowed an attacker to perform an unrestricted number… EPSS 0.5% 8.1, high

Beyond this page

Is CVE-2026-85236 in your network?

This page tells you how dangerous CVE-2026-85236 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-85236 comes with the devices to patch.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.