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Vulnerability record · CVE-2026-43911 · published 11 May 2026

CVE-2026-43911: Dani-garcia vaultwarden insufficient session expiration vulnerability

DDani Garcia · Vaultwarden

Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.5, refresh tokens are not invalidated when the user's security_stamp is rotated by some security-sensitive operations (password change, KDF change, key rotation, email change, org admin password reset, emergency access takeover). This allows an attacker holding a previously obtained refresh token to maintain session access even after the user has taken action to secure their account. This vulnerability is fixed in 1.35.5.

8.1 CVSS 3.1 High EPSS 0.31% · top 78.8% CWE-613 · Insufficient session expiration
8.1CVSS 3.1 base score
0.31%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.5, refresh tokens are not invalidated when the user's security_stamp is rotated by some security-sensitive operations (password change, KDF change, key rotation, email change, org admin password reset, emergency access takeover). This allows an attacker holding a previously obtained refresh token to maintain session access even after the user has taken action to secure their account. This vulnerability is fixed in 1.35.5.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-6j4w-g4jh-xjfx ExploitMitigationVendor Advisory
https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-6j4w-g4jh-xjfx ExploitMitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-43914Dani-garcia vaultwarden improper restriction of authentication attempts vulnerabilityVaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.4, there is a security vulnerability in Vaultwarden that allows bypassing…EPSS 0.49%9.8CVE-2024-55225Dani-garcia vaultwarden incorrect default permissions vulnerabilityAn issue in the component src/api/identity.rs of Vaultwarden prior to v1.32.5 allows attackers to impersonate users, including Administrators, via a …EPSS 0.61%9.6CVE-2024-55224Dani-garcia vaultwarden cross-site scripting vulnerabilityAn HTML injection vulnerability in Vaultwarden prior to v1.32.5 allows attackers to execute arbitrary code via injecting a crafted payload into the u…EPSS 0.83%8.8CVE-2024-39924Dani-garcia vaultwarden incorrect default permissions vulnerabilityAn issue was discovered in Vaultwarden (formerly Bitwarden_RS) 1.30.3. A vulnerability has been identified in the authentication and authorization pr…EPSS 13%8.7CVE-2026-43912Dani-garcia vaultwarden improper authorization vulnerabilityVaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.5, Vaultwarden does not enforce that a groups_users.users_organizations_u…EPSS 0.40%8.3CVE-2026-27802Dani-garcia vaultwarden improper privilege management vulnerabilityVaultwarden is an unofficial Bitwarden compatible server written in Rust, formerly known as bitwarden_rs. Prior to version 1.35.4, there is a privile…EPSS 0.37%8.3CVE-2026-27803Dani-garcia vaultwarden improper privilege management vulnerabilityVaultwarden is an unofficial Bitwarden compatible server written in Rust, formerly known as bitwarden_rs. Prior to version 1.35.4, when a Manager has…EPSS 0.37%8.1CVE-2026-43913Dani-garcia vaultwarden incorrect authorization vulnerabilityVaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.5, Vaultwarden allows an unconfirmed organization owner to purge the enti…EPSS 0.40%

Source: NIST National Vulnerability Database (record CVE-2026-43911), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.