BookStack vulnerabilities: known CVEs & security history
BookStack · Wiki · 21 tracked CVEs · 0 actively exploited · updated June 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all BookStack release lines — 21 in total. A CVE here doesn't mean your version is affected — check BookStack's current status and the safe version to run.
Known BookStack CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2021-4119 | critical | 9.8 | 27% | 2021 |
| CVE-2020-5256 | high | 7.9 | 2% | 2020 |
| CVE-2020-26211 | high | 7.7 | 1% | 2020 |
| CVE-2020-26210 | high | 7.7 | 1% | 2020 |
| CVE-2021-3944 | medium | 6.8 | 1% | 2021 |
| CVE-2023-6199 | medium | 6.5 | 1% | 2023 |
| CVE-2021-4194 | medium | 6.5 | 1% | 2022 |
| CVE-2021-3916 | medium | 6.5 | 1% | 2021 |
| CVE-2021-3906 | medium | 6.5 | 1% | 2021 |
| CVE-2021-3874 | medium | 6.5 | 1% | 2021 |
| CVE-2021-3758 | medium | 6.5 | 1% | 2021 |
| CVE-2020-26260 | medium | 6.4 | 1% | 2020 |
| CVE-2020-11055 | medium | 6.3 | 1% | 2020 |
| CVE-2021-3915 | medium | 5.7 | 1% | 2021 |
| CVE-2022-40690 | medium | 5.4 | 1% | 2022 |
| CVE-2022-0877 | medium | 5.4 | 1% | 2022 |
| CVE-2021-3768 | medium | 5.4 | 1% | 2021 |
| CVE-2021-3767 | medium | 5.4 | 1% | 2021 |
| CVE-2017-1000462 | medium | 5.4 | 1% | 2018 |
| CVE-2021-4026 | medium | 4.3 | 1% | 2021 |
| CVE-2023-4624 | low | 2.4 | 1% | 2023 |
Is my BookStack 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 BookStack version → · Monitor BookStack for new CVEs →
BookStack vulnerabilities — frequently asked
How many known vulnerabilities does BookStack have?
IsItPatched tracks 21 CVEs for BookStack. 1 is critical-severity and 3 high-severity. These span every release line — what matters is whether the version you run is affected.
Does BookStack have any actively-exploited vulnerabilities?
None of BookStack'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 BookStack vulnerability?
Among tracked issues, CVE-2021-4119 (CRITICAL, CVSS 9.8) ranks highest — a Improper access control weakness.
Is BookStack safe to use?
It depends on the version. The latest supported BookStack release 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: BookStack security status · BookStack end-of-life · actively-exploited CVEs. Always verify against BookStack's advisories — see our disclaimer.