CVE-2026-10856 Open redirect in MISP dashboard button widget URL handling
Attackers can craft dashboard buttons that redirect users to external sites, enabling phishing and credential theft in MISP deployments.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-10856?
CVE-2026-10856 is a medium-severity vulnerability in Misp-Project Misp, published on 4 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-601
Which versions are affected by CVE-2026-10856?
It affects 1 product.
Products include Misp-Project Misp.
How do I fix CVE-2026-10856?
No fix has been published for CVE-2026-10856 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-10856 being exploited?
There is no known exploitation of CVE-2026-10856 in the wild and no public exploit code.
Other vulnerabilities in Misp-Project Misp
Sources
Also known as GHSA-rx96-8w86-5hhh.