Is CVE-2026-43638 in the CISA KEV catalog?

No. CVE-2026-43638 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-43638?

CVE-2026-43638 has a CVSS v3 base score of 5.4 (MEDIUM).

What is the EPSS score for CVE-2026-43638?

CVE-2026-43638 has an EPSS score of 0.19% (9th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-43638?

Upgrade server to 2026.4.1 or later.

CVE & CISA-KEV Catalog

CVE-2026-43638

MEDIUM

5.4

CVSS v3

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.

CWE-862Missing Authorization

How to fix

Remediation Available

serverNVD

Affected:< 2026.4.1Fixed in:2026.4.1CVE-2026-43638derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.19%probability of exploitation in 30 days

9thpercentile

Low risk: more likely to be exploited than 9% of all known CVEs.

References

Patch2

Exploit1

sanjokkarki.com.np

Third-Party Advisory1

vulncheck.com

Release Notes1

github.com

Related Vulnerabilities

Other CWE-862 (Missing Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-39226	Critical	9.8	100%	KEV	Fix
CVE-2022-0543	Critical	10.0	100%	KEV	Fix
CVE-2021-21978	Critical	9.8	99%	-	Fix
CVE-2023-52163	High	8.8	96%	KEV	-
CVE-2022-1329	High	8.8	93%	-	-
CVE-2023-6875	Critical	9.8	90%	-	-

Embed a live status badge for CVE-2026-43638

Markdown

[![CVE-2026-43638](https://tridentstack.com/cve/badge/CVE-2026-43638.svg)](https://tridentstack.com/cve/CVE-2026-43638)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-43638"><img src="https://tridentstack.com/cve/badge/CVE-2026-43638.svg" alt="CVE-2026-43638"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-16.