How severe is CVE-2025-3228?

CVE-2025-3228 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-2025-3228 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-3228?

CVE-2025-3228 primarily affects Mattermost Mattermost Server. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-3228?

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

Does CVE-2025-3228 have an EU (EUVD) identifier?

Yes. CVE-2025-3228 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18757.

When was CVE-2025-3228 published?

CVE-2025-3228 was published on 2025-06-20 and last updated on 2026-06-17.

CVE-2025-3228

CVE-2025-3228 is a medium-severity vulnerability in Mattermost Mattermost Server 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-863.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-18757
Weakness: CWE-863
Affected product: Mattermost Mattermost Server
Published: 2025-06-20
Last modified: 2026-06-17

Description

Mattermost versions 10.5.x <= 10.5.5, 9.11.x <= 9.11.15, 10.8.x <= 10.8.0, 10.7.x <= 10.7.2, 10.6.x <= 10.6.5 fail to properly retrieve requestorInfo from playbooks handler for guest users which allows an attacker access to the playbook run.

Frequently asked questions

What is CVE-2025-3228?: Mattermost versions 10.5.x <= 10.5.5, 9.11.x <= 9.11.15, 10.8.x <= 10.8.0, 10.7.x <= 10.7.2, 10.6.x <= 10.6.5 fail to properly retrieve requestorInfo from playbooks handler for guest users which allows an attacker access to the playbook run.
How severe is CVE-2025-3228?: CVE-2025-3228 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-2025-3228 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-3228?: CVE-2025-3228 primarily affects Mattermost Mattermost Server. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-3228?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-3228 have an EU (EUVD) identifier?: Yes. CVE-2025-3228 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18757.
When was CVE-2025-3228 published?: CVE-2025-3228 was published on 2025-06-20 and last updated on 2026-06-17.

References

https://mattermost.com/security-updates

Affected products (5)

cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
cpe:2.3:a:mattermost:mattermost_server:10.8.0:-:*:*:*:*:*:*
cpe:2.3:a:mattermost:mattermost_server:10.8.0:rc1:*:*:*:*:*:*
cpe:2.3:a:mattermost:mattermost_server:10.8.0:rc2:*:*:*:*:*:*
cpe:2.3:a:mattermost:mattermost_server:10.8.0:rc3:*:*:*:*:*:*

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