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Vulnerability record · CVE-2026-43638 · published 11 May 2026

CVE-2026-43638: Bitwarden server missing authorization vulnerability

Bitwarden · Server

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.

5.3 CVSS 4.0 Medium EPSS 0.33% · top 76.9% CWE-862 · Missing authorization
5.3CVSS 4.0 base score
0.33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 1 tagged exploit
14 Jul 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/bitwarden/server/commit/ebbf6dd0fa752114c09d73abb48ce32a50476758 Patch
https://github.com/bitwarden/server/pull/7394 Issue TrackingPatch
https://github.com/bitwarden/server/releases/tag/v2026.4.1 Release Notes
https://sanjokkarki.com.np/blog/bitwarden-import-org-bypass ExploitThird Party Advisory
https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-organization-cipher-import Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-43638), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.