# CVE-2026-47164: Vaultwarden: SSO Email Auto-Link Can Bind an Existing Local Account to an Attacker-Controlled IdP Identity

> Attackers can hijack existing local accounts by binding them to attacker-controlled SSO identities when email matching is enabled.

- **Severity:** High 7.7 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Jul 2026
- **Updated:** 15 Jul 2026
- **Also known as:** GHSA-6x5c-84vm-5j56

## What is CVE-2026-47164?

CVE-2026-47164 is a high-severity authentication bypass vulnerability in dani-garcia vaultwarden, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.36.0, Vaultwarden's SSO login flow checked the IdP email_verified claim only for new-user creation and not when SSO_SIGNUPS_MATCH_EMAIL=true linked an IdP identity to an existing local account, allowing an attacker-controlled IdP identity asserting a victim email address to bind to and authenticate as that account. This issue is fixed in version 1.36.0.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-47164?


## How do I fix CVE-2026-47164?

No fix has been published for CVE-2026-47164 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-47164 being exploited?

There is no known exploitation of CVE-2026-47164 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-47164 and fix it if it is affected.

What it is: CVE-2026-47164 is a high-severity authentication bypass vulnerability in dani-garcia vaultwarden, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-47164 in the wild and no public exploit code.

Affected product: dani-garcia vaultwarden. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-47164/ (Markdown: https://insights.sbomify.com/CVE-2026-47164/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-47164
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-47164
- OSV: https://osv.dev/vulnerability/CVE-2026-47164

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-47164/
Summaries are generated and may contain mistakes; the official description above is the record.