Authorization Flaw in MISP Discussion Functionality from MISP
CVE-2026-103858

5.3MEDIUM

Key Information:

Vendor

Misp

Status
Misp
Vendor
CVE Published:
1 October 2026

What is CVE-2026-103858?

An authorization flaw in the discussion posting feature of MISP allows authenticated users to bypass access controls. This incomplete verification means users can both read restricted thread titles and post content in threads where they lack proper permissions. As a result, sensitive information may be disclosed and unauthorized content can be injected, presenting both security and integrity concerns for user engagements.

Affected Version(s)

MISP < 2.5.48

References

https://github.com/MISP/MISP/commit/79fbd4c75
patch

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Bastien Bossiroy and CĂ©lien Desteucq of NCIA
iglocska
Claude Opus 5.5 (1M context)
.