CVE-2026-43640 Vulnerability Analysis & Exploit Details

CVE-2026-43640
Vulnerability Scoring

8.1
/10
Severe Risk

Cybersecurity professionals consider CVE-2026-43640 an immediate threat requiring urgent mitigation.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-43640 Details

Status: Analyzed

Last updated: 🕒 16 May 2026, 03:04 UTC
Originally published on: 🕕 11 May 2026, 18:16 UTC

Time between publication and last update: 4 days

CVSS Release: version 3

CVSS3 Source

disclosure@vulncheck.com

CVSS3 Type

Primary

CVSS3 Vector

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

CVE-2026-43640 Vulnerability Summary

CVE-2026-43640: Bitwarden Server prior to v2026.4.1 does not require master-password re-authentication when retrieving or rotating an organization's SCIM API key, allowing an authenticated user with SCIM management privileges to obtain the key using only a valid session.

Assessing the Risk of CVE-2026-43640

Access Complexity Graph

The exploitability of CVE-2026-43640 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-43640

CVE-2026-43640 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-43640, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-43640, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2026-43640 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: High
    CVE-2026-43640 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: None
    CVE-2026-43640 does not impact system availability.

CVE-2026-43640 References

External References

CWE Common Weakness Enumeration

CWE-303

CAPEC Common Attack Pattern Enumeration and Classification

  • Reflection Attack in Authentication Protocol CAPEC-90 An adversary can abuse an authentication protocol susceptible to reflection attack in order to defeat it. Doing so allows the adversary illegitimate access to the target system, without possessing the requisite credentials. Reflection attacks are of great concern to authentication protocols that rely on a challenge-handshake or similar mechanism. An adversary can impersonate a legitimate user and can gain illegitimate access to the system by successfully mounting a reflection attack during authentication.

Vulnerable Configurations

  • cpe:2.3:a:bitwarden:server:1.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.0.3:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.1.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.1.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.2.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.3.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.3.1:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.3.1:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.3.2:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.3.2:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.3.3:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.3.3:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.3.4:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.3.4:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.4.1:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.5.1:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.5.1:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.7.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.8.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.8.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.8.1:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.8.2:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.8.2:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.9.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.9.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.10.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.10.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.11.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.11.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.11.1:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.11.1:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.12.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.12.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.12.1:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.12.1:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.13.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.13.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.13.1:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.13.1:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.14.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.14.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.14.1:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.14.1:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.14.2:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.14.2:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.15.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.15.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.15.1:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.15.1:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.16.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.16.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.17.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.17.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.17.1:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.17.1:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.17.2:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.17.2:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.18.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.18.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.18.1:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.18.1:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.19.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.19.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.20.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.20.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.21.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.21.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.22.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.22.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.23.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.23.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.24.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.24.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.25.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.25.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.26.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.26.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.27.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.27.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.28.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.28.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.29.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.29.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.30.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.30.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.30.1:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.30.1:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.30.2:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.30.2:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.30.3:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.30.3:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.30.4:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.30.4:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.31.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.31.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.31.1:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.31.1:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.32.0:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.32.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bitwarden:server:1.35.1:*:*:*:*:*:*:*
    cpe:2.3:a:bitwarden:server:1.35.1:*:*:*:*:*:*:*

Protect Your Infrastructure against CVE-2026-43640: Combat Critical CVE Threats

Stay updated with real-time CVE vulnerabilities and take action to secure your systems. Enhance your cybersecurity posture with the latest threat intelligence and mitigation techniques. Develop the skills necessary to defend against CVEs and secure critical infrastructures. Join the top cybersecurity professionals safeguarding today's infrastructures.

Other 5 Recently Published CVEs Vulnerabilities

  • CVE-2026-8293 – The Really Simple Security WordPress plugin before 9.5.10.1 does not enforce the second-factor challenge in two of its two-factor authentication R...
  • CVE-2026-8206 – The Kirki – Freeform Page Builder, Website Builder & Customizer plugin for WordPress is vulnerable to privilege escalation via account takeover in ...
  • CVE-2026-3198 – MLflow 3.9.0 with basic-auth (`--app-name basic-auth`) fails to enforce authorization checks for multiple Gateway API 'list' endpoints. Specificall...
  • CVE-2026-10583 – A security vulnerability has been detected in nextlevelbuilder GoClaw up to 3.11.3. Affected by this issue is the function Import of the file inter...
  • CVE-2026-10581 – A flaw has been found in DedeCMS 5.7.88. Affected by this vulnerability is the function base64_decode of the file /plus/download.php?open=1. This m...