CVE-2026-10856
Open redirect in MISP dashboard button widget URL handling
Description
A URL validation flaw in the MISP dashboard button widget allowed a crafted relative-looking URL to be accepted as a local path while being interpreted by browsers as an external URL. The validation rejected URLs containing an explicit scheme, host, or user component, but did not reject paths beginning with a slash followed by a backslash, such as /\example.com. Some browsers normalize backslashes in URLs as forward slashes, which can turn this into a scheme-relative external navigation target. In addition, the generated href concatenated the reconstructed URL with the original URL, increasing the possibility of unsafe or malformed link generation. An attacker able to configure or influence a dashboard button URL could craft a button that appears to point inside the application but redirects users to an attacker-controlled site when clicked. This could be used for phishing, credential theft, or social engineering. The patch fixes the issue by rejecting empty paths and paths starting with /\, and by emitting only the reconstructed validated URL in the anchor href.
INFO
Published Date :
June 4, 2026, 2:16 p.m.
Last Modified :
July 22, 2026, 8:10 p.m.
Remotely Exploit :
Yes !
Source :
5a6e4751-2f3f-4070-9419-94fb35b644e8
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 5a6e4751-2f3f-4070-9419-94fb35b644e8 | ||||
| CVSS 4.0 | MEDIUM | 5a6e4751-2f3f-4070-9419-94fb35b644e8 |
Solution
- Apply the patch provided for the MISP dashboard button widget.
- Reject empty paths and paths starting with /\.
- Ensure only validated URLs are used in href attributes.
- Update MISP dashboard button widget to the latest version.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-10856.
| URL | Resource |
|---|---|
| https://github.com/MISP/MISP/commit/f879f16fb5db7a9aab0a70fdcafea12ce4847e9a | Patch |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-10856 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-10856
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-10856 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-10856 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 22, 2026
Action Type Old Value New Value Added Translation Title: MISP, Description: Una falla de validación de URL en el widget del botón del panel de control de MISP permitió que una URL elaborada con apariencia relativa fuera aceptada como una ruta local mientras era interpretada por los navegadores como una URL externa. La validación rechazó URLs que contenían un esquema, host o componente de usuario explícito, pero no rechazó rutas que comenzaban con una barra diagonal seguida de una barra invertida, como /\example.com. Algunos navegadores normalizan las barras invertidas en las URLs como barras diagonales, lo que puede convertir esto en un objetivo de navegación externa relativo al esquema. Además, el href generado concatenaba la URL reconstruida con la URL original, aumentando la posibilidad de generación de enlaces inseguros o malformados. Un atacante capaz de configurar o influir en la URL de un botón del panel de control podría elaborar un botón que parece apuntar dentro de la aplicación pero redirige a los usuarios a un sitio controlado por el atacante cuando se hace clic. Esto podría usarse para phishing, robo de credenciales o ingeniería social. El parche soluciona el problema al rechazar rutas vacías y rutas que comienzan con /\, y al emitir solo la URL validada reconstruida en el href del ancla. -
CPE Deprecation Remap by [email protected]
Jun. 22, 2026
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:* versions from (excluding) 2.5.39 OR *cpe:2.3:a:misp-project:misp:*:*:*:*:*:*:*:* versions from (excluding) 2.5.39 -
CVE Modified by 5a6e4751-2f3f-4070-9419-94fb35b644e8
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'misp', 'product': 'misp', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'semver', 'lessThanOrEqual': '2.5.38'}], 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-10856', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-04T13:47:03.689030Z'} -
Initial Analysis by [email protected]
Jun. 08, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:* versions up to (excluding) 2.5.39 Added Reference Type CIRCL: https://github.com/MISP/MISP/commit/f879f16fb5db7a9aab0a70fdcafea12ce4847e9a Types: Patch -
New CVE Received by 5a6e4751-2f3f-4070-9419-94fb35b644e8
Jun. 04, 2026
Action Type Old Value New Value Added Description A URL validation flaw in the MISP dashboard button widget allowed a crafted relative-looking URL to be accepted as a local path while being interpreted by browsers as an external URL. The validation rejected URLs containing an explicit scheme, host, or user component, but did not reject paths beginning with a slash followed by a backslash, such as /\example.com. Some browsers normalize backslashes in URLs as forward slashes, which can turn this into a scheme-relative external navigation target. In addition, the generated href concatenated the reconstructed URL with the original URL, increasing the possibility of unsafe or malformed link generation. An attacker able to configure or influence a dashboard button URL could craft a button that appears to point inside the application but redirects users to an attacker-controlled site when clicked. This could be used for phishing, credential theft, or social engineering. The patch fixes the issue by rejecting empty paths and paths starting with /\, and by emitting only the reconstructed validated URL in the anchor href. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:L/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:Green Added CWE CWE-601 Added Reference https://github.com/MISP/MISP/commit/f879f16fb5db7a9aab0a70fdcafea12ce4847e9a