PatchTheCVECVE-2026-43638: Bitwarden Server prior to v2026.4.1 contains a missing authorization vulnerability that allows any authenticat
CVE-2026-43638 is a medium-severity flaw (CVSS 5.4) affecting server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Bitwarden Server prior to v2026.4.1 contains a missing authorization vulnerability that allows any authenticated user to write ciphers into an arbitrary organization via `POST /ciphers/import-organization` by submitting an empty `collections` array, which causes the server-side permission check to be skipped.
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.4 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.2% (top 92%) |
| CISA exploited list | No |
| Weakness | CWE-862 |
| Published | 2026-05-11 |
| Last modified | 2026-10-26 |
Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-43638?
server: upgrade to 2026.4.1. Exact commands for each OS are on this page.
Is CVE-2026-43638 being exploited?
CVE-2026-43638 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-43638 affect?
CVE-2026-43638 affects server. Severity is medium (CVSS 5.4). Bitwarden Server prior to v2026.4.1 contains a missing authorization vulnerability that allows any authenticated user to write ciphers into an arbitrary organization via `POST /ciphers/import-organization` by submitting an empty `collection
How urgent is CVE-2026-43638?
Priority 26/100. Public exploit reference
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