CVE-2026-27802
published 2026-03-04CVE-2026-27802: Vaultwarden is an unofficial Bitwarden compatible server written in Rust, formerly known as bitwarden_rs. Prior to version 1.35.4, there is a privilege…
PriorityP352high8.3CVSS 3.1
AVNACLPRLUINSUCHIHAL
EPSS
0.29%
20.9th percentile
Vaultwarden is an unofficial Bitwarden compatible server written in Rust, formerly known as bitwarden_rs. Prior to version 1.35.4, there is a privilege escalation vulnerability via bulk permission update to unauthorized collections by Manager. 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
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
OSV
Vaultwarden has Privilege Escalation via Bulk Permission Update to Unauthorized Collections by Manager
osv·2026-03-04
CVE-2026-27802 [HIGH] Vaultwarden has Privilege Escalation via Bulk Permission Update to Unauthorized Collections by Manager
Vaultwarden has Privilege Escalation via Bulk Permission Update to Unauthorized Collections by Manager
## Summary
A Manager account (`access_all=false`) was able to escalate privileges by directly invoking the **bulk-access API** against collections that were not originally assigned to them.
The API allowed changing `assigned=false` to `assigned=true`, resulting in unauthorized access.
Additionally, prior to the bulk-access call, the regular single-update API correctly returned **401 Unauthorized** for the same collection. After executing the bulk-access API, the same update API returned **200 OK**, confirming an authorization gap at the HTTP level.
---
## Description
* The endpoint accepts `ManagerHeadersLoose` and does not validate access rights for the specified `collectionIds`.
s
GHSA
Vaultwarden has Privilege Escalation via Bulk Permission Update to Unauthorized Collections by Manager
ghsa·2026-03-04
CVE-2026-27802 [HIGH] CWE-269 Vaultwarden has Privilege Escalation via Bulk Permission Update to Unauthorized Collections by Manager
Vaultwarden has Privilege Escalation via Bulk Permission Update to Unauthorized Collections by Manager
## Summary
A Manager account (`access_all=false`) was able to escalate privileges by directly invoking the **bulk-access API** against collections that were not originally assigned to them.
The API allowed changing `assigned=false` to `assigned=true`, resulting in unauthorized access.
Additionally, prior to the bulk-access call, the regular single-update API correctly returned **401 Unauthorized** for the same collection. After executing the bulk-access API, the same update API returned **200 OK**, confirming an authorization gap at the HTTP level.
---
## Description
* The endpoint accepts `ManagerHeadersLoose` and does not validate access rights for the specified `collectionIds`.
s
Red Hat
vaultwarden: Vaultwarden: Privilege Escalation via Unauthorized Bulk Permission Update
vendor_redhat·2026-03-04·CVSS 8.3
CVE-2026-27802 [HIGH] CWE-266 vaultwarden: Vaultwarden: Privilege Escalation via Unauthorized Bulk Permission Update
vaultwarden: Vaultwarden: Privilege Escalation via Unauthorized Bulk Permission Update
Vaultwarden is an unofficial Bitwarden compatible server written in Rust, formerly known as bitwarden_rs. Prior to version 1.35.4, there is a privilege escalation vulnerability via bulk permission update to unauthorized collections by Manager. This issue has been patched in version 1.35.4.
A flaw was found in Vaultwarden. A manager, an authorized user, can exploit this vulnerability by performing a bulk permission update to collections they are not authorized to access. This can lead to privilege escalation, allowing the manager to gain unauthorized access and control over these collections.
Statement: IMPORTANT: This privilege escalation vulnerability in Vaultwarden allows a Manager to update permiss
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-27802 vaultwarden-web: Vaultwarden: Privilege Escalation via Unauthorized Bulk Permission Update [epel-9]
bugzilla·2026-03-05·CVSS 8.3
CVE-2026-27802 [HIGH] CVE-2026-27802 vaultwarden-web: Vaultwarden: Privilege Escalation via Unauthorized Bulk Permission Update [epel-9]
CVE-2026-27802 vaultwarden-web: Vaultwarden: Privilege Escalation via Unauthorized Bulk Permission Update [epel-9]
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-b41e450a81 (vaultwarden-web-2026.4.1-1.el9) has been submitted as an update to Fedora EPEL 9.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-b41e450a81
---
FEDORA-EPEL-2026-b41e450a81 has been pushed to the Fedora EPEL 9 testing repository.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-b41e450a81
See also https://fedoraproject.org/wiki/QA:Updates_Testing
Bugzilla
CVE-2026-27802 vaultwarden-web: Vaultwarden: Privilege Escalation via Unauthorized Bulk Permission Update [fedora-43]
bugzilla·2026-03-05·CVSS 8.3
CVE-2026-27802 [HIGH] CVE-2026-27802 vaultwarden-web: Vaultwarden: Privilege Escalation via Unauthorized Bulk Permission Update [fedora-43]
CVE-2026-27802 vaultwarden-web: Vaultwarden: Privilege Escalation via Unauthorized Bulk Permission Update [fedora-43]
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-2026-064873552d (vaultwarden-web-2026.4.1-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-064873552d
Bugzilla
CVE-2026-27802 vaultwarden-web: Vaultwarden: Privilege Escalation via Unauthorized Bulk Permission Update [fedora-42]
bugzilla·2026-03-05·CVSS 8.3
CVE-2026-27802 [HIGH] CVE-2026-27802 vaultwarden-web: Vaultwarden: Privilege Escalation via Unauthorized Bulk Permission Update [fedora-42]
CVE-2026-27802 vaultwarden-web: Vaultwarden: Privilege Escalation via Unauthorized Bulk Permission Update [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 a currently
Bugzilla
CVE-2026-27802 vaultwarden: Vaultwarden: Privilege Escalation via Unauthorized Bulk Permission Update [fedora-42]
bugzilla·2026-03-05·CVSS 8.3
CVE-2026-27802 [HIGH] CVE-2026-27802 vaultwarden: Vaultwarden: Privilege Escalation via Unauthorized Bulk Permission Update [fedora-42]
CVE-2026-27802 vaultwarden: Vaultwarden: Privilege Escalation via Unauthorized Bulk Permission Update [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 a currently mai
Wiz
CVE-2026-27802 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 8.3
CVE-2026-27802 [HIGH] CVE-2026-27802 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-27802 :
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, there is a privilege escalation vulnerability via bulk permission update to unauthorized collections by Manager. 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 Severity HIGH No Fix Added at: Mar 08, 2026
Ru
2026-03-04
Published