EUVD-2026-72372
GHSA-m9p6-76x3-7vxp
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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
PR:L for required authenticated widget-write access; UI:R because a second user must interact with the widget; S:C because script executes in the victim's distinct browser session context.
Primary rating from Vendor (CIRCL).
CVSS VectorVendor: CIRCL
Lifecycle Timeline
2DescriptionCVE.org
Affected versions of MISP insufficiently validate URLs used by dashboard widgets, particularly the Button widget.
The widget's URL is stored configuration controlled by a user. The previous renderer considered a URL safe if it appeared relative or if its parsed hostname matched the configured MISP hostname. That logic failed to reject dangerous schemes and URL forms that browsers normalize differently from PHP's URL parsing.
As a result, values such as javascript: URLs or backslash-based authority forms could reach the generated anchor's href and execute script or navigate to an attacker-controlled origin when another user interacted with the widget. The upstream commit describes the issue as:
“javascript: and backslash URLs reached the href (stored XSS)”.
The fix routes widget URLs through a shared DashboardURLValidator, rejects dangerous schemes, raw backslashes, control characters, and unauthorized absolute origins, and validates the URL both in the widget handler and renderer.
Version affected: ≤2.5.45
AnalysisAI
Stored XSS in MISP's dashboard Button widget (≤2.5.45) allows an authenticated low-privilege user to embed javascript: URLs or WHATWG-normalized backslash authority forms into widget configuration, which execute in the browser of any analyst who subsequently interacts with that widget. The root cause is a parser differential between PHP's URL handling and the WHATWG URL Standard implemented by browsers: forms such as \\evil.com or /\evil.com appear relative or host-matching under PHP's parse_url() but resolve to an off-origin authority in modern browsers. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a valid MISP account with permissions to create or edit dashboard widgets - specifically the Button widget - on a dashboard visible to other users. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.1 (Medium) reflects the realistic exploitation prerequisites accurately: the attacker must hold a valid MISP account with dashboard widget write access (PR:L), and a second authenticated user must interact with the weaponized widget (UI:P), preventing fully automated or unauthenticated mass exploitation. … 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 | Upgrade MISP to a version incorporating upstream commit adf704e94 (https://github.com/MISP/MISP/commit/adf704e94), which introduces the DashboardURLValidator class and applies it in both ButtonWidget.php and the dashboard renderer. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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