VulnerabilityPublished 11 May 2026

CVE-2026-43912: dani-garcia vaultwarden · Improper Authorization

Affects dani-garcia vaultwardenSource CVE Database V5

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Not known to be exploited · CVSS 8.7 High : upgrade to 1.35.5 soon.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score

8.7High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 21% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 1.35.5

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: High
User Interaction: None
Scope: Changed
Confidentiality: High
Integrity: High
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: High: The attacker is authorized with (i.e., requires) privileges that provide significant (e.g., administrative) control over the vulnerable component that could affect component-wide settings and files.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 11 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade vaultwarden and dani-garcia/vaultwarden to 1.35.5.

Affected software

Product	Affected	Fixed in
dani-garciavaultwarden	Affected <1.35.5	Fixed in 1.35.5
GitHubdani-garcia/vaultwarden`pkg:github/dani-garcia/vaultwarden`Other threats	Affected <1.35.5	Fixed in 1.35.5

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

This vulnerability is fixed in Vaultwarden version 1.35.5. Users should upgrade to version 1.35.5 or later to remediate this issue. No other official remediation or temporary fixes are documented. Since this is not a cloud service, patching the affected software is required to mitigate the risk.

Description

Vaultwarden versions prior to 1.35.5 contain an improper authorization vulnerability that allows an attacker with admin privileges in one organization and low privileges in another to escalate access across organizations. The flaw arises because group-management endpoints do not verify that membership and collection IDs belong to the same organization, enabling unauthorized access and modification of vault data from another organization. This vulnerability is fixed in version 1.35.5.

Impact

An attacker with admin rights in one organization and low privileges in another can gain unauthorized read and write access to vault data in the second organization by exploiting improper authorization checks. This leads to a complete compromise of confidentiality and integrity of the affected organization's vault data. Availability is not impacted. The CVSS 3.1 base score is 8.7 (High), reflecting network attack vector, low attack complexity, high privileges required, no user interaction, scope change, and high impact on confidentiality and integrity.

Summary

CVE-2026-43912 is an improper authorization vulnerability (CWE-285) in Vaultwarden before version 1.35.5. The issue occurs because the application does not enforce consistency checks between organization membership UUIDs and group or collection UUIDs. An attacker who is an admin in Organization A and a low-privileged member in Organization B can bind Organization B membership UUIDs into Organization A groups. This allows the attacker to enumerate and access Organization B's vault data through Organization A's elevated privileges, including reading and writing vault items. The vulnerability is resolved in Vaultwarden 1.35.5.

CWE-285Improper Authorization (opens in a new tab)
Class weaknessLikelihood of exploit: HighOWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.
MITRE discourages mapping vulnerabilities to this broad entry; the root cause is usually a more specific weakness.
Architecture and Design
Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) to enforce the roles at the appropriate boundaries.
Architecture and Design
Ensure that you perform access control checks related to your business logic. These checks may be different than the access control checks that you apply to more generic resources such as files, connections, processes, memory, and database records.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
OWASP Cheat Sheets
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V8.3.8 (opens in a new tab)
V13.4.2 (opens in a new tab)
V7.2.2 (opens in a new tab)
Attack patterns
Accessing Functionality Not Properly Constrained by ACLs (opens in a new tab)
Cross Zone Scripting (opens in a new tab)
Directory Indexing (opens in a new tab)
Subverting Environment Variable Values (opens in a new tab)
Using Malicious Files (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

github.com/dani-garcia/vaultwarden/security/advisories/GHSA-569v-845w-g82p (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 19 May 2026, 11:01 UTC

WeaknessesCWE-285

Technical details

References

Community reviews

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