CVE•Published 2026-05-11•Modified 2026-05-16•1 article on news•6 live references•NVD data
CVE-2026-43639Bitwarden · Server
Vulnerability data via NVD (ingested)
CVSS v3.1
8.0
HIGH
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS percentile
—
Weaknesses (CWE)
Description
Bitwarden Server prior to v2026.4.0 contains a missing authorization vulnerability that allows a provider service user to add an arbitrary organization to their provider via `POST /providers/{providerId}/clients/existing`, resulting in takeover of the target organization; self-hosted installations are unaffected as this endpoint is restricted to Cloud via SelfHosted(NotSelfHostedOnly = true).
Timeline
Published 2026-05-11
Modified 2026-05-16
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-43639Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Bitwarden Server"All exposed Bitwarden Server instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Server"HTTP body or banner mentions "Server" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-43639Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-43639Censys host search filtered to this CVE id.
grep.app
CVE-2026-43639Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-43639GitHub code search for direct mentions.
Google dork
"CVE-2026-43639" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-43639 on GitHub.