# CVE-2026-81027: one-api through 0.6.10 Missing Authorization on URL-Parameter Channel Pinning

> Low-privilege users can bypass authorization to access unauthorized API channels and provider keys via URL parameters.

- **Severity:** High 8.4 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Aug 2026
- **Updated:** 26 Aug 2026
- **Also known as:** GHSA-877p-7prq-ffj6

## What is CVE-2026-81027?

CVE-2026-81027 is a high-severity missing authorization vulnerability in songquanpeng one-api, published on 26 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

one-api gates one of its two channel-pinning paths and not the other. middleware/auth.go permits a request to name a specific channel either through a suffix on the API key or through a URL path parameter. The suffix path is reached only after model.IsAdmin succeeds and otherwise rejects the caller, while the path-parameter branch sets the selected-channel value from c.Param("channelid") with no role check at all. The route carrying that parameter sits behind token authentication only, so any account holding a valid API token reaches it. The value flows to the distributor, which loads the channel by integer identifier with no scoping to the caller's user or group, and then sets the outbound Authorization header to that channel's stored key and directs the request at the channel's base URL. A low-privilege account can therefore pin any channel by incrementing an identifier, causing the server to make upstream requests bearing an operator-configured provider key the account was never granted, and bypassing both the per-group restriction and the channel's model allowlist.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-81027?


## How do I fix CVE-2026-81027?

No fix has been published for CVE-2026-81027 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-81027 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-81027 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-81027 and fix it if it is affected.

What it is: CVE-2026-81027 is a high-severity missing authorization vulnerability in songquanpeng one-api, published on 26 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-81027 exists.

Affected product: songquanpeng one-api. 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-2026-81027/ (Markdown: https://insights.sbomify.com/CVE-2026-81027/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-81027
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-81027
- OSV: https://osv.dev/vulnerability/CVE-2026-81027

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-81027/
Summaries are generated and may contain mistakes; the official description above is the record.