CVE-2026-27803 | Vaultwarden: Collection Management Operations Allowed Without `manage` Verification for Manager Role

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.

Published: 2026-03-04 Last update: 2026-03-06 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-27803 is rated Low Risk (38.9/100): CVSS High severity, with low exploitation likelihood (EPSS 0.05%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-27803

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-05 0.04% 0.05% +0.01%
2 2026-03-05 — 0.04% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-27803

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.3 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.8 5.5 [email protected]

Weakness enumeration for CVE-2026-27803

GitHub Security Advisory for CVE-2026-27803

GHSA-h4hq-rgvh-wh27 · Severity: high · Ecosystem: rust — Vaultwarden's Collection Management Operations Allowed Without `manage` Verification for Manager Role

OS Trackers for CVE-2026-27803

vendor priority summary link
alpine — CVE-2026-27803: 1 source package rows (vaultwarden); 18 state rows across 2 repos (3.23-community, edge-community); fixed 0, open 18. https://security.alpinelinux.org/vuln/CVE-2026-27803
redhat high — https://access.redhat.com/security/cve/CVE-2026-27803

Affected software / configurations for CVE-2026-27803

Vendor Product Version Raw CPE
dani-garcia vaultwarden < 1.35.4 cpe:2.3:a:dani-garcia:vaultwarden:*:*:*:*:*:*:*:*

References for CVE-2026-27803

cvelogic Threat Intelligence