CVE-2020-8894Network attack vector

Discussion thread disclosure via incomplete ACL enforcement

Published Feb 11, 2020 · Updated Aug 4, 2024

Improper access control in MISP before 2.4.121 allows remote authenticated users to read discussion threads outside their authorized scope. The ThreadsController view and index paths applied incomplete distribution and sharing-group filters instead of consistently calling Thread::checkIfAuthorised against the underlying event. Access to a MISP account and a crafted thread request is required; successful exploitation exposes discussions belonging to inaccessible events or sharing groups.

CVSS severity6.5
Medium
EPSS probability1.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in MISP before 2.4.121 allows remote authenticated users to read discussion threads outside their authorized scope. The ThreadsController view and index paths applied incomplete distribution and sharing-group filters instead of consistently calling Thread::checkIfAuthorised against the underlying event. Access to a MISP account and a crafted thread request is required; successful exploitation exposes discussions belonging to inaccessible events or sharing groups.

The record

CVE
CVE-2020-8894
Published
Feb 11, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 11, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.4NVDAV:N/AC:L/Au:N/C:P/I:P/A:N
6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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