How severe is CVE-2026-27898?

CVE-2026-27898 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-27898 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27898?

CVE-2026-27898 affects Dani-garcia Vaultwarden. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27898?

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

Does CVE-2026-27898 have an EU (EUVD) identifier?

Yes. CVE-2026-27898 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9504.

When was CVE-2026-27898 published?

CVE-2026-27898 was published on 2026-03-04 and last updated on 2026-06-17.

CVE-2026-27898

CVE-2026-27898 is a medium-severity vulnerability in Dani-garcia Vaultwarden with a CVSS 3.x base score of 5.4. 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-639.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9504
Weakness: CWE-639
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, an authenticated regular user can specify another user’s cipher_id and call "PUT /api/ciphers/{id}/partial" Even though the standard retrieval API correctly denies access to that cipher, the partial update endpoint returns 200 OK and exposes cipherDetails (including name, notes, data, secureNote, etc.). This issue has been patched in version 1.35.4.

Frequently asked questions

What is CVE-2026-27898?: Vaultwarden is an unofficial Bitwarden compatible server written in Rust, formerly known as bitwarden_rs. Prior to version 1.35.4, an authenticated regular user can specify another user’s cipher_id and call "PUT /api/ciphers/{id}/partial" Even though the standard retrieval API correctly denies access to that cipher, the partial update endpoint returns 200 OK and exposes cipherDetails (including name, notes, data, secureNote, etc.). This issue has been patched in version 1.35.4.
How severe is CVE-2026-27898?: CVE-2026-27898 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-27898 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27898?: CVE-2026-27898 affects Dani-garcia Vaultwarden. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27898?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-27898 have an EU (EUVD) identifier?: Yes. CVE-2026-27898 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9504.
When was CVE-2026-27898 published?: CVE-2026-27898 was published on 2026-03-04 and last updated on 2026-06-17.

References

https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-w9f8-m526-h7fh

Affected products (1)

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

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