CVE-2026-43638

Name: CVE-2026-43638
Creator: NVD / NIST
Published: 2026-05-11T18:16:36.823+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.19%

Last modified Jun 17, 2026

CVE-2026-43638 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 0.19% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS 4.0

5.3/10

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:X/V:X/RE:X/U:X

EPSS Probability

0.19%

8.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-862

Affected Software

Vendor	Product	Versions
Bitwarden	Server	< 2026.4.1

References

https://github.com/bitwarden/server/commit/ebbf6dd0fa752114c09d73abb48ce32a50476758Patch
https://github.com/bitwarden/server/pull/7394Issue Tracking, Patch
https://github.com/bitwarden/server/releases/tag/v2026.4.1Release Notes
https://sanjokkarki.com.np/blog/bitwarden-import-org-bypassExploit, Third Party Advisory
https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-organization-cipher-importThird Party Advisory

Timeline

Published: May 11, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-43638?

How severe is CVE-2026-43638?

CVE-2026-43638 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.

How do I fix CVE-2026-43638?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-43638?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST