CVE-2026-43638

Summary

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.

Affected Software

Weaknesses

• CWE-862: Missing Authorization

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

References

• https://sanjokkarki.com.np/blog/bitwarden-import-org-bypass
• https://github.com/bitwarden/server/releases/tag/v2026.4.1
• https://github.com/bitwarden/server/pull/7394
• https://github.com/bitwarden/server/commit/ebbf6dd0fa752114c09d73abb48ce32a50476758
• https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-organization-cipher-import

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