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CVE-2026-86347: MISP

Severity

7.1 (HIGH)

Vendor

MISP

Affected versions

0 through 2.5.45

Patch status

Unknown

Published

2026-09-07T10:16:55.917

Modified

2026-09-07T10:16:55.917

Why it matters

This matters because the affected product may allow attackers to read or write files outside intended paths, which can expose sensitive configuration or lead to code execution.

Recommended admin actions

• Review and patch based on exposure, asset criticality, and business impact.
• Review logs for suspicious activity related to the affected application or component.

Technical summary

Affected versions of MISP allow any authenticated user to access TemplatesController::uploadFile() because the ACL entry for templates/uploadFile used the wildcard *. This bypasses the intended role restrictions applied to neighboring template-management operations. The upload handler accepts arbitrary content with only minimal checks and writes it into app/tmp/files/. A low-privileged or read-only user can therefore repeatedly upload files and consume server disk space without requiring perm_add or perm_template. The fix changes the ACL requirement from * to perm_add. The commit also rules out stronger impacts: uploaded files receive random names, path traversal/predictable overwrite is not available, the temporary directory is outside the web root, and the files are not directly served over HTTP. Therefore, the issue should not be described as arbitrary file overwrite, stored XSS, or RCE. Version affected: ≤2.5.45

View the official NVD record for CVE-2026-86347

CVE data is sourced from NVD/CNA records and optional enrichment. Validate against the vendor advisory before taking production action.