# CVE-2025-12414: Looker account compromise via punycode homograph attack

> Attackers can compromise Looker accounts via punycode homograph attacks in OIDC configurations, requiring upgrades for self-hosted instances.

- **Severity:** Critical 9.2 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/U:Amber`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Nov 2025
- **Updated:** 20 Nov 2025
- **Also known as:** GHSA-5vh2-6vmq-fw7j

## What is CVE-2025-12414?

CVE-2025-12414 is a critical authentication bypass vulnerability in Google Cloud Looker, published on 20 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An attacker could take over a Looker account in a Looker instance configured with OIDC authentication, due to email address string normalization.Looker-hosted and Self-hosted were found to be vulnerable.

This issue has already been mitigated for Looker-hosted.

Self-hosted instances must be upgraded as soon as possible. This vulnerability has been patched in all supported versions of Self-hosted.
The versions below have all been updated to protect from this vulnerability. You can download these versions at the Looker download page   https://download.looker.com/ :
  *  24.12.100+
  *  24.18.193+
  *  25.0.69+
  *  25.6.57+
  *  25.8.39+
  *  25.10.22+
  *  25.12.0+

Weakness: CWE-290 (Authentication Bypass by Spoofing)

## Which versions are affected by CVE-2025-12414?


## How do I fix CVE-2025-12414?

No fix has been published for CVE-2025-12414 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-12414 being exploited?

There is no known exploitation of CVE-2025-12414 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-12414 and fix it if it is affected.

What it is: CVE-2025-12414 is a critical authentication bypass vulnerability in Google Cloud Looker, published on 20 Nov 2025. 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-2025-12414 in the wild and no public exploit code.

Affected product: Google Cloud Looker. 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-2025-12414/ (Markdown: https://insights.sbomify.com/CVE-2025-12414/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-12414
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-12414
- OSV: https://osv.dev/vulnerability/CVE-2025-12414

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-12414/
Summaries are generated and may contain mistakes; the official description above is the record.