Mattermost vulnerabilities
- Mattermost has 424 CVE records published between 28 Oct 2023 and 28 Oct 2026, ranking #36 of 420 vendors on this site by that count.
- Of the 424 with a CVSS score, 42 (9.9%) are rated critical or high; 0 (0% of all) have no CVSS score.
- None of the CVE records attributed to Mattermost is listed in CISA's KEV catalog as of 28 Oct 2026.
Records are attributed to Mattermost from the vendor named in the source records. About the data.
CVE records per year
Show data as a table
| Year | CVE records |
|---|---|
| 2017 | 0 |
| 2018 | 0 |
| 2019 | 0 |
| 2020 | 0 |
| 2021 | 5 |
| 2022 | 25 |
| 2023 | 84 |
| 2024 | 95 |
| 2025 | 119 |
| 2026 | 183 |
2026 is partial (through 28 Oct 2026), shown in a lighter bar.
| Year | Records | Critical | High | Critical or high | Not scored |
|---|---|---|---|---|---|
| 2026 | 183 | 0 | 17 | 9.3% | 0% |
| 2025 | 119 | 6 | 10 | 13.4% | 0% |
| 2024 | 95 | 0 | 6 | 6.3% | 0% |
| 2023 | 84 | 0 | 7 | 8.3% | 0% |
| 2022 | 25 | 0 | 0 | 0% | 0% |
| 2021 | 5 | 0 | 1 | 20% | 0% |
| 2020 | 0 | 0 | 0 | — | — |
| 2019 | 0 | 0 | 0 | — | — |
| 2018 | 0 | 0 | 0 | — | — |
| 2017 | 0 | 0 | 0 | — | — |
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Highest exploit-prediction scores (EPSS)
EPSS estimates the probability that a vulnerability is exploited in the next 30 days. These are the 10 highest-scoring Mattermost records today.
| CVE | EPSS | Percentile | Severity | In KEV |
|---|---|---|---|---|
| CVE-2025-25279 | 24.2% | 97.8% | Critical | No |
| CVE-2021-37859 | 3.3% | 88.4% | High | No |
| CVE-2022-3257 | 1.3% | 69.5% | Low | No |
| CVE-2022-4044 | 1.1% | 66.1% | Medium | No |
| CVE-2022-3147 | 1% | 63.6% | Low | No |
| CVE-2025-4981 | 1% | 63.2% | Critical | No |
| CVE-2022-1982 | 0.9% | 60.9% | Medium | No |
| CVE-2022-0904 | 0.9% | 60.3% | Medium | No |
| CVE-2022-1337 | 0.9% | 60.1% | Medium | No |
| CVE-2021-37861 | 0.9% | 59.8% | Medium | No |
Source: FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.27, as of 27 Oct 2026. About the data.