# FiftyOne App server uses wildcard CORS (Access-Control-Allow-Origin: \*), enabling cross-origin reads of local server data

Advisory record · `GHSA-q78p-hj9h-5466`

- **Identifiers:** `GHSA-q78p-hj9h-5466` · `CVE-2026-53656` · `PYSEC-2026-3465`
- **State:** Confirmed
- **Severity:** CVSS 6.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-346](https://cwe.mitre.org/data/definitions/346.html) · [CWE-942](https://cwe.mitre.org/data/definitions/942.html)
- **Tags:** [CWE-346](https://agentprime.io/advisories/tag/cwe-346.md) · [CWE-942](https://agentprime.io/advisories/tag/cwe-942.md)
- **Published:** 15 Jul 2026
- **Updated:** 23 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 15 Jul 2026, 21:57 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `fiftyone` (PyPI): affected `<1.17.0`; fixed in `1.17.0`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> FiftyOne versions before 1.17.0 send a wildcard CORS header (Access-Control-Allow-Origin: \*) from the App server and its /media route. An unauthenticated attacker can get a user with a running FiftyOne server to visit a malicious web page, which can then read files the server process can access and send them elsewhere. Upgrade to FiftyOne 1.17.0 or later, which restricts cross-origin access to same-origin by default.

Written 5 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 6.3 Medium, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0012, the 1st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:41 UTC: First seen by agentprime
- 31 Oct 2026, 14:41 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-q78p-hj9h-5466)

## Sources

- [GitHub Advisory Database: GHSA-q78p-hj9h-5466](https://github.com/advisories/GHSA-q78p-hj9h-5466)
- [OSV: GHSA-q78p-hj9h-5466](https://osv.dev/vulnerability/GHSA-q78p-hj9h-5466)
- <https://github.com/voxel51/fiftyone/security/advisories/GHSA-q78p-hj9h-5466>
- <https://github.com/voxel51/fiftyone/commit/7c5b92eec5c7c0210c0c8134351ced77d2800ae0>
- <https://github.com/voxel51/fiftyone>
- <https://github.com/voxel51/fiftyone/releases/tag/v1.17.0>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-q78p-hj9h-5466>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-q78p-hj9h-5466/>. Everything for agents: <https://agentprime.io/llms.txt>.