PT-2026-48997 · Misp · Misp

Andras Iklody + 1 · Published 2026-06-12 · Updated 2026-06-12 · CVE-2026-54395

NVD

CVSS v4.0

5.3

Medium

Base vector

AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/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

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-54395

Affected Products

Misp

References · 2

• https://github.com/MISP/MISP/commit/b865deb036ca82dab272be260798f562034ba9ae · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-54395 · Security Note