CVE-2026-103239
Deferred
Deferred - Pending Action
Privilege Escalation in MISP via Tag Collection Manipulation
Vulnerability report for CVE-2026-103239, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-09-30
Last updated on: 2026-09-30
Assigner: CIRCL
Description
Description
MISP contains a privilege escalation vulnerability in the tag collection creation and editing functionality. The affected actions accepted the full HTTP request payload and passed it to a bulk-association save operation, which writes not only the intended tag collection record but also any associated model data present in the payload.
A user holding the tag editor permission could craft a request that includes additional model data (such as User or Organisation records) alongside the tag collection fields. Because the save operation processed all associated models indiscriminately, the injected sibling records were written to the database, enabling the attacker to modify or create privileged accounts and escalate to site administrator.
Preconditions:
- An authenticated account with the tag editor permission (perm_tag_editor)
- Network access to the MISP instance
Impact:
- Unauthorized creation or modification of User and Organisation records
- Privilege escalation from tag editor to site administrator
Affected versions: < 2.5.48
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| misp | misp | to 2.5.48 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-284 | The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. |
| CWE-862 | The product does not perform an authorization check when an actor attempts to access a resource or perform an action. |
