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MISP CVE-2026-90895

| EUVDEUVD-2026-77344 HIGH
Missing Authorization (CWE-862)
2026-09-14 CIRCL GHSA-rx79-g748-j44m
8.4
CVSS 4.0 · Vendor: CIRCL
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Severity by source

Vendor (CIRCL) PRIMARY
8.4 HIGH
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.1 HIGH

Local shell access plus a low-privileged MISP account required; high C/I from plaintext credential disclosure and ACL bypass via `use`; no availability impact.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (CIRCL).

CVSS VectorVendor: CIRCL

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

5
Metadata Corrected
Sep 14, 2026 - 10:40 vuln.today
tag: Information Disclosure added
Metadata Corrected
Sep 14, 2026 - 10:40 vuln.today
tag: Authentication Bypass removed
Source Code Evidence Fetched
Sep 14, 2026 - 10:21 vuln.today
Analysis Generated
Sep 14, 2026 - 10:21 vuln.today
CVE Published
Sep 14, 2026 - 09:40 cve.org
HIGH 8.4

DescriptionCVE.org

Affected versions of MISP’s interactive CLI shell implement access control independently from the normal web application, causing several authorization inconsistencies.

The patch shows that CLI access could differ from the web application in multiple security-sensitive areas:

  • feed listings did not enforce the same lookup_visible restrictions for non-host-organisation users;
  • feed detail access did not enforce the same host-organisation/site-admin authorization as FeedsController::view();
  • Feed.headers, which can contain HTTP authorization credentials, could be exposed instead of being hidden or masked;
  • server synchronization authkey values were not explicitly hidden from CLI detail output;
  • sharing-group detail access did not consistently use SharingGroup::checkIfAuthorised();
  • the use command could establish context for a record without first proving that the user was authorized to view that record

The commit additionally hardens pagination and terminal rendering, including neutralization of terminal control sequences found in database-backed values. Those are important hardening changes, but the main vulnerability is the CLI authorization/data-disclosure mismatch.

Version affected: ≤2.5.45

AnalysisAI

MISP's interactive CLI shell (≤2.5.45) enforces access control independently from the web application, creating at least six distinct authorization gaps that allow authenticated local users to retrieve sensitive credentials and bypass record-level ACLs. Feed HTTP authorization headers (Feed.headers), server synchronization authkeys, sharing-group memberships, and feed visibility restrictions are all enforced correctly in the web tier but not in the CLI, while the use command allows a user to establish an unauthorized record context without proving read rights. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Vulnerability AssessmentAI

Exploitation Exploitation requires three concurrent conditions: (1) a valid MISP user account at any privilege level below site-admin; (2) local OS-level shell access to the MISP server (e.g., SSH, direct console, or container exec), since the CLIShell is not accessible via the web interface; and (3) MISP version 2.5.45 or earlier. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.4 with vector AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N accurately reflects the realistic threat model. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation The primary remediation is to upgrade MISP to a version incorporating commit cd9f548ed (available at https://github.com/MISP/MISP/commit/cd9f548ed), which the vendor has confirmed resolves all six authorization gaps. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify all staff with local shell access to MISP servers and restrict access for non-administrative users if operationally feasible; simultaneously obtain the latest patched MISP version from your vendor. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-90895 vulnerability details – vuln.today

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