How severe is CVE-2026-43911?

CVE-2026-43911 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-43911 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-43911?

CVE-2026-43911 affects Dani-garcia Vaultwarden. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-43911?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-43911 have an EU (EUVD) identifier?

Yes. CVE-2026-43911 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29339.

When was CVE-2026-43911 published?

CVE-2026-43911 was published on 2026-05-11 and last updated on 2026-06-17.

CVE-2026-43911

CVE-2026-43911 is a medium-severity vulnerability in Dani-garcia Vaultwarden with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-613.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29339
Weakness: CWE-613
Affected product: Dani-garcia Vaultwarden
Published: 2026-05-11
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-43911?: 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.
How severe is CVE-2026-43911?: CVE-2026-43911 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-43911 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-43911?: CVE-2026-43911 affects Dani-garcia Vaultwarden. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-43911?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-43911 have an EU (EUVD) identifier?: Yes. CVE-2026-43911 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29339.
When was CVE-2026-43911 published?: CVE-2026-43911 was published on 2026-05-11 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:dani-garcia:vaultwarden:*:*:*:*:*:*:*:*

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