EUVD-2026-70500
GHSA-mj6h-p8f5-39rh
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-delivered reflected XSS requires victim click (UI:R); injection executes in browser scope distinct from server (S:C); impacts limited to low confidentiality and integrity, no availability impact.
Primary rating from Vendor (CIRCL).
CVSS VectorVendor: CIRCL
Lifecycle Timeline
2DescriptionCVE.org
MISP contains a reflected Cross-Site Scripting (XSS) vulnerability in the event attribute filtering query builder. The taggedAttributes and galaxyAttachedAttributes URL parameters were inserted into the query-builder rules without HTML escaping before being serialized as JSON and embedded inside a <script> element.
Because JsonTool::encode() uses JSON_UNESCAPED_SLASHES, an attacker-controlled value containing a closing </script> sequence could terminate the surrounding script element and inject arbitrary HTML or JavaScript. For example, a specially crafted viewEventAttributes URL could contain malicious content in one of the affected filter parameters.
An attacker could exploit the vulnerability by convincing an authenticated MISP user to follow a crafted URL. Successful exploitation would execute attacker-controlled JavaScript in the security context of the MISP instance and with the privileges of the victim's authenticated browser session. This could allow access to information available to the victim, modification of data through authenticated requests, or other actions permitted by the victim's MISP permissions.
The vulnerability is addressed by applying HTML escaping with h() to both scalar and array values before they are inserted into the DOM.
AnalysisAI
Reflected XSS in MISP's event attribute filtering query builder allows an unauthenticated attacker to execute arbitrary JavaScript in the security context of any authenticated MISP user who follows a crafted viewEventAttributes URL. The taggedAttributes and galaxyAttachedAttributes URL parameters are serialized via PHP's JsonTool::encode() with JSON_UNESCAPED_SLASHES and embedded raw into a <script> element; an attacker-controlled </script> sequence in either parameter breaks out of the script block and injects arbitrary HTML or JavaScript. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must be currently authenticated to a MISP instance running a vulnerable version and must actively click (or otherwise navigate to) a specially crafted viewEventAttributes URL containing a malicious taggedAttributes or galaxyAttachedAttributes parameter value. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:H) scores 6.1 Medium. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the upstream patch available at https://github.com/MISP/MISP/commit/de51a16db, which adds h() HTML escaping to both scalar and array values of taggedAttributes and galaxyAttachedAttributes in eventFilteringQueryBuilder.ctp before they are inserted into the script block. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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