Open redirect in MISP dashboard button widget URL handling (CVE-2026-10856) | HOL Guard CVE

Medium · CVSS 6.1CVE-2026-10856

Open redirect in MISP dashboard button widget URL handling

Answer in brief

CVE-2026-10856 records a Medium severity (CVSS 6.1) vulnerability in Open redirect in MISP dashboard button widget URL handling. The current sources do not mark it as known exploited. The current feed maps misp/misp (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 4, 2026Updated Jun 22, 2026Source checked Sep 19, 2026First seen by HOL Jun 22, 2026Material review Jun 22, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.1
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps misp/misp (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
misp/mispgeneric	0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for misp/misp.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jun 4, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jun 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 22, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.