# CVE-2026-86840: Bifrost Unauthorized Channel Commission Attribution Allows Commission Diversion

> Attackers can divert protocol commissions by minting tokens under unauthorized channel IDs, affecting Bifrost blockchain users and operators.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Sep 2026
- **Updated:** 10 Sep 2026
- **Also known as:** GHSA-wm9v-x9j6-gf6x

## What is CVE-2026-86840?

CVE-2026-86840 is a critical missing authorization vulnerability in Bitfrost.io Bifrost, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The `vtoken-minting` and `slpx` pallets in Bifrost contain an improper authorization vulnerability in channel commission attribution. A signed account can supply an arbitrary registered `channel_id` when minting tokens without verifying that the caller is authorized to mint on behalf of that channel. This allows an attacker to inflate a channel's recorded mint volume and cause protocol commission payments to be disproportionately distributed to that channel during commission settlement.

Weakness: CWE-862 (Missing Authorization), CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-86840?


## How do I fix CVE-2026-86840?

No fix has been published for CVE-2026-86840 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-86840 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86840 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-86840 and fix it if it is affected.

What it is: CVE-2026-86840 is a critical missing authorization vulnerability in Bitfrost.io Bifrost, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86840 exists.

Affected product: Bitfrost.io Bifrost. 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-2026-86840/ (Markdown: https://insights.sbomify.com/CVE-2026-86840/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-86840
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-86840
- OSV: https://osv.dev/vulnerability/CVE-2026-86840

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-86840/
Summaries are generated and may contain mistakes; the official description above is the record.