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High severity · published May 11, 2026
CVE-2026-43911
Vaultwarden: Refresh tokens not invalidated on security stamp rotation
8.1
CVSS
0.2%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VA
vaultwarden · dani-garcia
< 1.35.5 · source: vendor, NVD
Affected product
VA
vaultwarden
dani-garcia
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43911
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-43911
Exploit
https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-6j4w-g4jh-xjfx
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