CVE-2026-54395 Details
Description
MISP contains a reflected cross-site scripting vulnerability in the UiBeta event index view. The urlparams value is inserted into an inline JavaScript handler using HTML escaping inside a single-quoted JavaScript string. Because browsers HTML-decode attribute values before JavaScript parsing, a crafted searcheventinfo value can restore encoded quote characters and break out of the JavaScript string. An attacker could craft a malicious URL that, when opened by a victim using the UiBeta event index, executes arbitrary JavaScript in the victim’s browser in the context of the MISP instance. The issue is fixed by encoding the value as a JavaScript string literal with json_encode() before applying HTML escaping at the attribute layer.
A reflected cross-site scripting vulnerability has been identified in MISP within the UiBeta event index view. The issue arises because the urlparams value is inserted into an inline JavaScript handler using HTML escaping within a single-quoted JavaScript string. Browsers HTML-decode attribute values before parsing JavaScript, allowing a crafted searcheventinfo value to restore encoded quote characters and escape the JavaScript string. This vulnerability enables an attacker to execute arbitrary JavaScript in the context of the victim's MISP instance. The vulnerability affects several versions of MISP.
The vulnerability has been fixed in MISP version 2.5.40 by properly encoding the urlparams value as a JavaScript string literal using json_encode() before applying HTML escaping.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 12, 2026CISA-ADP
Assessed Jun 15, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/MISP/MISP/commit/b865deb036ca82dab272be260798f562034ba9ae | CIRCL | Source CodeVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | CIRCL |
Affected Products
| Product | Versions |
|---|---|
| MISP | All versions |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | CIRCL |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 12, 2026 | New CVE Received | CIRCL |