CVE-2023-2787

MEDIUMNVD 6.56.5—

6.5

Mattermost fails to check channel membership when accessing message threads, allowing an attacker to access arbitrary posts by using the message threads API.

CVSS v3: 6.5
EG Score: 6.5(medium)
EPSS: 40.6%
KEV: Not listed

Published

June 16, 2023

Last Modified

November 21, 2024

References (2)

responsibledisclosure@mattermosthttps://mattermost.com/security-updates/
af854a3a-2127-422b-91ae-364da2661108https://mattermost.com/security-updates/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-862Missing Authorization

Data Freshness Timeline

(refreshed 13× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-05 22:46 UTCepss_batch
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Frequently asked(5)

What is CVE-2023-2787?

CVE-2023-2787 is a medium vulnerability published on June 16, 2023. Mattermost fails to check channel membership when accessing message threads, allowing an attacker to access arbitrary posts by using the message threads API.

When was CVE-2023-2787 disclosed?

CVE-2023-2787 was first published in the National Vulnerability Database on June 16, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-2787 actively exploited?

CVE-2023-2787 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 40.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-2787?

CVE-2023-2787 has a CVSS v3 base score of 6.5 (NVD).

How do I remediate CVE-2023-2787?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-2787, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-2787

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Is Your Infrastructure Affected by CVE-2023-2787?

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Frequently asked(5)

What is CVE-2023-2787?

When was CVE-2023-2787 disclosed?

Is CVE-2023-2787 actively exploited?

What is the CVSS score of CVE-2023-2787?

CVE-2023-2787 has a CVSS v3 base score of 6.5 (NVD).

How do I remediate CVE-2023-2787?

CVE-2023-2787

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-2787?

CVE-2023-2787

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-2787?

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References (2)

Frequently asked(5)

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References (2)

Frequently asked(5)

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