How severe is CVE-2026-27803?

CVE-2026-27803 has a CVSS 3.x base score of 8.3, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability low.

Is CVE-2026-27803 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27803?

CVE-2026-27803 affects Dani-garcia Vaultwarden. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27803?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-27803 have an EU (EUVD) identifier?

Yes. CVE-2026-27803 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9503.

When was CVE-2026-27803 published?

CVE-2026-27803 was published on 2026-03-04 and last updated on 2026-06-17.

CVE-2026-27803

CVE-2026-27803 is a high-severity vulnerability in Dani-garcia Vaultwarden with a CVSS 3.x base score of 8.3. 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-269.

Key facts

Severity: High (CVSS 3.x base score 8.3)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9503
Weakness: CWE-269
Affected product: Dani-garcia Vaultwarden
Published: 2026-03-04
Last modified: 2026-06-17

Description

Vaultwarden is an unofficial Bitwarden compatible server written in Rust, formerly known as bitwarden_rs. Prior to version 1.35.4, when a Manager has manage=false for a given collection, they can still perform several management operations as long as they have access to the collection. This issue has been patched in version 1.35.4.

Frequently asked questions

What is CVE-2026-27803?: Vaultwarden is an unofficial Bitwarden compatible server written in Rust, formerly known as bitwarden_rs. Prior to version 1.35.4, when a Manager has manage=false for a given collection, they can still perform several management operations as long as they have access to the collection. This issue has been patched in version 1.35.4.
How severe is CVE-2026-27803?: CVE-2026-27803 has a CVSS 3.x base score of 8.3, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability low.
Is CVE-2026-27803 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27803?: CVE-2026-27803 affects Dani-garcia Vaultwarden. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27803?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-27803 have an EU (EUVD) identifier?: Yes. CVE-2026-27803 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9503.
When was CVE-2026-27803 published?: CVE-2026-27803 was published on 2026-03-04 and last updated on 2026-06-17.

References

https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-h4hq-rgvh-wh27

Affected products (1)

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

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