CVE-2026-27803
published 2026-03-04CVE-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…
PriorityP351high8.3CVSS 3.1
AVNACLPRLUINSUCHIHAL
EPSS
0.29%
20.3th percentile
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.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| dani-garcia | vaultwarden | < 1.35.4 | 1.35.4 |
| dani-garcia | vaultwarden | >= 0 < 1.35.4 | 1.35.4 |
CVSS provenance
nvdv3.18.3HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
vendor_redhat8.3HIGH
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GHSA
Vaultwarden's Collection Management Operations Allowed Without `manage` Verification for Manager Role
ghsa·2026-03-04
CVE-2026-27803 [HIGH] CWE-269 Vaultwarden's Collection Management Operations Allowed Without `manage` Verification for Manager Role
Vaultwarden's Collection Management Operations Allowed Without `manage` Verification for Manager Role
## Summary
Testing confirmed that even when a Manager has `manage=false` for a given collection, they can still perform the following management operations as long as they have access to the collection:
* `PUT /api/organizations//collections/` succeeds (HTTP 200)
* `PUT /api/organizations//collections//users` succeeds (HTTP 200)
* `DELETE /api/organizations//collections/` succeeds (HTTP 200)
## Description
* The Manager guard checks only whether the user **can access the collection**, not whether they have `manage` privileges. This check is directly applied to management endpoints.
src/auth.rs:816
```rust
if !Collection::can_access_collection(&headers.membership, &col_id, &conn).awa
OSV
Vaultwarden's Collection Management Operations Allowed Without `manage` Verification for Manager Role
osv·2026-03-04
CVE-2026-27803 [HIGH] Vaultwarden's Collection Management Operations Allowed Without `manage` Verification for Manager Role
Vaultwarden's Collection Management Operations Allowed Without `manage` Verification for Manager Role
## Summary
Testing confirmed that even when a Manager has `manage=false` for a given collection, they can still perform the following management operations as long as they have access to the collection:
* `PUT /api/organizations//collections/` succeeds (HTTP 200)
* `PUT /api/organizations//collections//users` succeeds (HTTP 200)
* `DELETE /api/organizations//collections/` succeeds (HTTP 200)
## Description
* The Manager guard checks only whether the user **can access the collection**, not whether they have `manage` privileges. This check is directly applied to management endpoints.
src/auth.rs:816
```rust
if !Collection::can_access_collection(&headers.membership, &col_id, &conn).awa
Red Hat
vaultwarden: Vaultwarden: Unauthorized collection management operations due to improper access control
vendor_redhat·2026-03-04·CVSS 8.3
CVE-2026-27803 [HIGH] CWE-266 vaultwarden: Vaultwarden: Unauthorized collection management operations due to improper access control
vaultwarden: Vaultwarden: Unauthorized collection management operations due to improper access control
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.
A flaw was found in Vaultwarden. An authenticated manager, even when explicitly denied management privileges for a collection, could still perform various unauthorized management operations on that collection. This improper access control could lead to unauthorized information disclosure and data modification within the affected collection.
Statement: This i
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-27803 vaultwarden-web: Vaultwarden: Unauthorized collection management operations due to improper access control [fedora-42]
bugzilla·2026-03-05·CVSS 8.3
CVE-2026-27803 [HIGH] CVE-2026-27803 vaultwarden-web: Vaultwarden: Unauthorized collection management operations due to improper access control [fedora-42]
CVE-2026-27803 vaultwarden-web: Vaultwarden: Unauthorized collection management operations due to improper access control [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug reports from releases that are no longer
maintained. At that time this bug will be closed as EOL if it remains open with a
'version' of '42'.
Package Maintainer: If you wish for this bug to remain open because you
plan to fix i
Bugzilla
CVE-2026-27803 vaultwarden-web: Vaultwarden: Unauthorized collection management operations due to improper access control [epel-10]
bugzilla·2026-03-05·CVSS 8.3
CVE-2026-27803 [HIGH] CVE-2026-27803 vaultwarden-web: Vaultwarden: Unauthorized collection management operations due to improper access control [epel-10]
CVE-2026-27803 vaultwarden-web: Vaultwarden: Unauthorized collection management operations due to improper access control [epel-10]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
FEDORA-EPEL-2026-c4971fa237 (vaultwarden-web-2026.4.1-1.el10_2) has been submitted as an update to Fedora EPEL 10.2.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-c4971fa237
---
FEDORA-EPEL-2026-f88f773927 (vaultwarden-web-2026.4.1-1.el10_3) has been submitted as an update to Fedora EPEL 10.3.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-f88f773927
---
FEDORA-EPEL-2026-c4971fa237 has been pushed to
Bugzilla
CVE-2026-27803 vaultwarden: Vaultwarden: Unauthorized collection management operations due to improper access control [fedora-42]
bugzilla·2026-03-05·CVSS 8.3
CVE-2026-27803 [HIGH] CVE-2026-27803 vaultwarden: Vaultwarden: Unauthorized collection management operations due to improper access control [fedora-42]
CVE-2026-27803 vaultwarden: Vaultwarden: Unauthorized collection management operations due to improper access control [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug reports from releases that are no longer
maintained. At that time this bug will be closed as EOL if it remains open with a
'version' of '42'.
Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in
Wiz
CVE-2026-27803 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 8.3
CVE-2026-27803 [HIGH] CVE-2026-27803 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-27803 :
Rust vulnerability analysis and mitigation
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.
Source : NVD
## 8.3
Score
Published March 4, 2026
Severity HIGH
CNA Score 8.3
Affected Technologies
Rust
NixOS
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 16.1
Exploitation Probability (EPSS) 0.1
Affected packages and libraries
vaultwarden
Sources
NVD
Alpine 3.19, 3.20, 3.21, 3.22 Seve
2026-03-04
Published