How severe is CVE-2021-37867?

CVE-2021-37867 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2021-37867 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-37867?

CVE-2021-37867 affects Mattermost Mattermost Boards. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-37867?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-37867 published?

CVE-2021-37867 was published on 2022-01-18 and last updated on 2026-06-17.

CVE-2021-37867

CVE-2021-37867 is a medium-severity vulnerability in Mattermost Mattermost Boards with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Mattermost Mattermost Boards
Published: 2022-01-18
Last modified: 2026-06-17

Description

Mattermost Boards plugin v0.10.0 and earlier fails to protect email addresses of all users via one of the Boards APIs, which allows authenticated and unauthorized users to access this information resulting in sensitive & private information disclosure.

Frequently asked questions

What is CVE-2021-37867?: Mattermost Boards plugin v0.10.0 and earlier fails to protect email addresses of all users via one of the Boards APIs, which allows authenticated and unauthorized users to access this information resulting in sensitive & private information disclosure.
How severe is CVE-2021-37867?: CVE-2021-37867 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2021-37867 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-37867?: CVE-2021-37867 affects Mattermost Mattermost Boards. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-37867?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-37867 published?: CVE-2021-37867 was published on 2022-01-18 and last updated on 2026-06-17.

References

https://mattermost.com/security-updates/

Affected products (1)

cpe:2.3:a:mattermost:mattermost_boards:*:*:*:*:*:*:*:*

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