Mastodon vulnerabilities: known CVEs & security history
Mastodon · Comms / Social · 42 tracked CVEs · 0 actively exploited · updated June 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Mastodon release lines — 42 in total. A CVE here doesn't mean your version is affected — check Mastodon's current status and the safe version to run.
Known Mastodon CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2023-36460 | critical | 9.9 | 37% | 2023 |
| CVE-2022-2166 | critical | 9.8 | 1% | 2022 |
| CVE-2022-24307 | critical | 9.8 | 1% | 2022 |
| CVE-2018-21018 | critical | 9.8 | 3% | 2019 |
| CVE-2024-23832 | critical | 9.4 | 2% | 2024 |
| CVE-2023-36459 | critical | 9.3 | 1% | 2023 |
| CVE-2024-25623 | high | 8.5 | 1% | 2024 |
| CVE-2026-27468 | high | 8.2 | 0% | 2026 |
| CVE-2024-37903 | high | 8.2 | 1% | 2024 |
| CVE-2023-28853 | high | 7.7 | 1% | 2023 |
| CVE-2026-41259 | high | 7.5 | 0% | 2026 |
| CVE-2026-23962 | high | 7.5 | 0% | 2026 |
| CVE-2026-22245 | high | 7.5 | 0% | 2026 |
| CVE-2023-49952 | high | 7.5 | 0% | 2024 |
| CVE-2023-36461 | high | 7.5 | 1% | 2023 |
| CVE-2022-46405 | high | 7.5 | 1% | 2022 |
| CVE-2023-42451 | high | 7.4 | 1% | 2023 |
| CVE-2026-25540 | medium | 6.5 | 0% | 2026 |
| CVE-2026-23964 | medium | 6.5 | 0% | 2026 |
| CVE-2026-22246 | medium | 6.5 | 0% | 2026 |
| CVE-2023-42452 | medium | 6.1 | 0% | 2023 |
| CVE-2022-0432 | medium | 6.1 | 4% | 2022 |
| CVE-2026-27477 | medium | 5.9 | 0% | 2026 |
| CVE-2024-34535 | medium | 5.9 | 0% | 2024 |
| CVE-2023-42450 | medium | 5.4 | 0% | 2023 |
| CVE-2023-36462 | medium | 5.4 | 1% | 2023 |
| CVE-2026-23961 | medium | 5.3 | 0% | 2026 |
| CVE-2025-54879 | medium | 5.3 | 1% | 2025 |
| CVE-2025-27399 | medium | 5.3 | 0% | 2025 |
| CVE-2025-27157 | medium | 5.3 | 0% | 2025 |
| CVE-2022-31263 | medium | 5.3 | 1% | 2022 |
| CVE-2026-33869 | medium | 4.8 | 0% | 2026 |
| CVE-2026-33868 | medium | 4.3 | 1% | 2026 |
| CVE-2026-23963 | medium | 4.3 | 0% | 2026 |
| CVE-2025-62605 | medium | 4.3 | 0% | 2025 |
| CVE-2025-62176 | medium | 4.3 | 0% | 2025 |
| CVE-2025-62175 | medium | 4.3 | 0% | 2025 |
| CVE-2022-48364 | medium | 4.3 | 1% | 2023 |
| CVE-2024-25618 | medium | 4.2 | 0% | 2024 |
| CVE-2025-67500 | low | 3.7 | 0% | 2025 |
| CVE-2025-62174 | low | 3.5 | 0% | 2025 |
| CVE-2024-25619 | low | 3.1 | 0% | 2024 |
Is my Mastodon version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your Mastodon version → · Monitor Mastodon for new CVEs →
Mastodon vulnerabilities — frequently asked
How many known vulnerabilities does Mastodon have?
IsItPatched tracks 42 CVEs for Mastodon. 6 are critical-severity and 11 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Mastodon have any actively-exploited vulnerabilities?
None of Mastodon's tracked CVEs are currently in CISA's KEV catalog — but new ones can be added at any time, so keep your version current.
What is the most severe Mastodon vulnerability?
Among tracked issues, CVE-2023-36460 (CRITICAL, CVSS 9.9) ranks highest — a Path traversal weakness.
Is Mastodon safe to use?
It depends on the version. The latest supported Mastodon release (4.5.11) clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: Mastodon security status · Mastodon end-of-life · actively-exploited CVEs. Always verify against Mastodon's advisories — see our disclaimer.