What is the CVSS score of CVE-2026-27802?

CVE-2026-27802 has a CVSS 3.1 base score of 8.3 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-27802?

Within 24 hours: Audit all Manager-role users in Vaultwarden and review recent collection access logs for suspicious activity. Within 7 days: Upgrade Vaultwarden to version 1.35.4 or later once available; if unavailable, implement network access controls restricting Manager role privileges. Within 30 days: Conduct a full access review of all collections and validate that no unauthorized modifications occurred during the vulnerability window.

Vaultwarden CVE-2026-27802

HIGH

Improper Privilege Management (CWE-269)

2026-03-04 security-advisories@github.com

GHSA-r32r-j5jq-3w4m

Privilege Escalation Red Hat Vaultwarden Dani Garcia

8.3

CVSS 3.1 · GitHub Advisory

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Authenticate as Manager user
Exploit

Access bulk permission update endpoint
Execution

Modify collection permissions unauthorized
Impact

Escalate privileges to restricted collections

Vulnerability Assessment

Weakness	CWE CWE-269 OWASP Top 10:2025 A06:2025 - Insecure Design ASVS 5.0 V8 - Authorization Least privilege enforcement MITRE ATT&CK 1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Authenticated Manager account required. Vaultwarden versions prior to 1.35.4. Bulk permission update API endpoint must be accessible. Target collections must exist and lack proper authorization validation in permission modification logic.
Impact	CVSS 8.3 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Exploitation no authentication required.
Exploit ScenarioDerived	An attacker without authentication could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Vaultwarden versions before 1.35.4 contain a privilege escalation vulnerability that allows authenticated Manager-level users to modify permissions on collections they should not have access to. An attacker with Manager role can exploit this during bulk permission updates to gain unauthorized access to sensitive collections. A patch is available in version 1.35.4 and should be applied immediately.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:05 CVSS 8.3

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. [CVSS 8.3 HIGH]

RemediationAI

Fixed in version 1.35.4.. Restrict network access to the affected service where possible.

Affected Packages

cargo vaultwarden fix: 1.35.4

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in cargo

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-269 (Improper Privilege Management). Affects Vaultwarden. 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.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 8.3 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

Red Hat 8.1 HIGH

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

Low

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

CVE Published

Mar 04, 2026 - 22:16 nvd

HIGH 8.3

DescriptionGitHub Advisory

Executive ViewAI

Why It Matters

Vaultwarden users running versions prior to 1.35.4 face a privilege escalation risk where Manager-role users can gain unauthorized access to collections they should not manage. This vulnerability could compromise sensitive credential storage and allow unauthorized users to view or modify critical passwords and secrets across the organization.

Business Impact: High

Compensating Controls

Until patch 1.35.4 is available: (1) Restrict Manager role assignments to only trusted administrators; (2) Implement network segmentation to limit Manager user access to Vaultwarden; (3) Disable bulk permission update features if UI allows; (4) Enable and monitor all audit logging for collection permission changes; (5) Require MFA for all Manager-level accounts; (6) Consider temporary role downgrade of non-critical Manager accounts.

Threat Intelligence Overview

EPSS Score

0.0%

Top 86% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS Vendor

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +42

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.