CVE-2026-112178 MISP Proposal ACL Bypass: Incomplete Distribution Level Check in Shadow Attribute Access Control
Attackers can view unauthorized proposal data on attributes due to flawed distribution level checks in MISP.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-112178?
CVE-2026-112178 is a high-severity missing authorization vulnerability in MISP, published on 19 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
MISP contains an access control flaw in the proposal (shadow attribute) visibility logic. The authorization check accepted any attribute or object carrying one of the user's sharing groups without verifying the distribution level, and denied the owning organisation access to proposals on its own organisation-only attributes.
- A user belonging to a sharing group could view proposals on attributes or objects with that sharing group, regardless of the attribute's distribution level (levels 1-3 should restrict visibility)
- The owning organisation could not view proposals on its own org-only attributes
Security impact: Unauthorized disclosure of proposed attribute changes to users who should not have access based on distribution level restrictions.
Affected: <2.5.48
Weakness: CWE-862
Which versions are affected by CVE-2026-112178?
How do I fix CVE-2026-112178?
No fix has been published for CVE-2026-112178 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-112178 being exploited?
There is no known exploitation of CVE-2026-112178 in the wild and no public exploit code.
Sources
Also known as GHSA-9h3q-39v8-fmg5.