CVE-2026-43639

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Source
https://cve.org/CVERecord?id=CVE-2026-43639
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43639.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-43639
Published
2026-05-11T17:14:04Z
Modified
2026-10-21T02:31:01Z
Severity
  • 8.9 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H CVSS Calculator
Summary
Bitwarden Server < 2026.4.0 Missing Authorization via Provider Clients
Details

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).

Database specific 
{
    "cna_assigner":  "VulnCheck",
    "cwe_ids":  [
        "CWE-862"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43639.json"
}
References

Affected packages

Git / github.com/bitwarden/server

Affected ranges

Type
GIT
Repo
https://github.com/bitwarden/server
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
a2efc7409cea90dfb9ffae309851935f57294f3f
Fixed
0918bfdda6f5eec391c69bd9074f6aef4eac0b1d
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:bitwarden:server:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "2026.4.0"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "range":  [
                {
                    "fixed":  "0918bfdda6f5eec391c69bd9074f6aef4eac0b1d"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v2026.4.0",
            "range":  [
                {
                    "fixed":  "a2efc7409cea90dfb9ffae309851935f57294f3f"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

1.*
1.22.0
1.4.0
v1.*
v1.0.0
v1.0.1
v1.0.2
v1.0.3
v1.1.0
v1.10.0
v1.11.0
v1.11.1
v1.12.0
v1.12.1
v1.13.0
v1.13.1
v1.14.0
v1.14.1
v1.14.2
v1.15.0
v1.15.1
v1.16.0
v1.17.0
v1.17.1
v1.17.2
v1.18.0
v1.19.0
v1.2.0
v1.20.0
v1.21.0
v1.23.0
v1.24.0
v1.25.0
v1.26.0
v1.27.0
v1.28.0
v1.29.0
v1.3.0
v1.3.1
v1.3.2
v1.3.3
v1.3.4
v1.30.0
v1.30.1
v1.30.2
v1.30.3
v1.30.4
v1.31.0
v1.31.1
v1.32.0
v1.33.0
v1.33.1
v1.34.0
v1.35.0
v1.35.1
v1.36.0
v1.36.1
v1.37.0
v1.37.1
v1.37.2
v1.38.0
v1.38.1
v1.38.2
v1.39.0
v1.4.1
v1.5.0
v1.5.1
v1.6.0
v1.7.0
v1.8.0
v1.8.1
v1.8.2
v1.9.0
v2024.*
v2024.1.2
v2024.10.1
v2024.2.3
v2024.5.0
v2024.8.0
v2024.8.1
v2025.*
v2025.10.1
v2025.7.1
v2025.8.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43639.json"