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Back to active CVEs
High · CVSS 7.1CVE-2026-91825

MISP: Missing Authorization Check for Event Sharing Group When Distribution Field Is Omitted During EditCVE-2026-91825

Answer in brief

CVE-2026-91825 records a High severity (CVSS 7.1) vulnerability in MISP: Missing Authorization Check for Event Sharing Group When Distribution Field Is Omitted During Edit. 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 Sep 15, 2026Updated Sep 16, 2026Source checked Oct 30, 2026First seen by HOL Sep 15, 2026Material review Sep 16, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.1. 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
PackageAffected rangeFixed version
MISP/MISPgeneric>=0 <2.5.462.5.46

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for MISP/MISP.
  2. 2Review the reported fix. Source-reported solution: The fix adds an explicit authorization check for the sharing_group_id in the code path where the distribution field is omitted from the edit request. In the controller, if no distribution is submitted but a sharing_group_id is present and differs from the stored value, the user's access to that sharing group is verified via checkIfCanBeUsed before the edit proceeds. In the model's _edit method, a parallel check via checkIfAuthorised is added for the same condition, returning an error if the user is not authorized for the submitted sharing group. This closes the gap where omitting the distribution field bypassed the existing authorization gate.

Evidence timeline and material changes

  1. Published upstream

    Sep 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 15, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
Upstream source description

Affected versions of MISP fail to authorize a submitted sharing group in a specific event-edit path. The vulnerable logic checked whether the acting user could use a sharing_group_id only when the request explicitly supplied distribution = 4. If the attacker instead omitted distribution but supplied a different sharing_group_id, that authorization branch was skipped. Later, MISP’s field-recovery logic restored the existing event distribution from storage. For events already configured with sharing-group distribution, the unauthorized sharing-group ID could therefore be saved. The fix adds authorization checks in both the controller and Event::_edit() whenever a non-empty sharing_group_id is supplied without distribution. The model now calls SharingGroup::checkIfAuthorised() before persisting the change. Version affected: ≤2.5.45

Quoted source text, attributed separately from HOL analysis.

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  • BuddyForms < 2.10.1 - Subscriber+ Arbitrary Post ModificationAlso CWE-862
  • Content Egg <= 12.0.0 - Missing Authorization to Authenticated (Contributor+) Arbitrary Post Meta Modification via 'post_id' Parameter via cegg_update_products AJAX ActionAlso CWE-862
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Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-862
Source
CVE List V5
Source checked
Oct 30, 2026
References
1 linked source
Open source record