# Flask-CORS allows for inconsistent CORS matching

Advisory record · `GHSA-8vgw-p6qm-5gr7`

- **Identifiers:** `GHSA-8vgw-p6qm-5gr7` · `CVE-2024-6844` · `PYSEC-2026-1385`
- **State:** Confirmed
- **Severity:** CVSS 5.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-346](https://cwe.mitre.org/data/definitions/346.html)
- **Tags:** [CWE-346](https://agentprime.io/advisories/tag/cwe-346.md)
- **Published:** 20 Mar 2025
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 20 Mar 2025, 12:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `flask-cors` (PyPI): affected `<6.0.0`; fixed in `6.0.0`

## Machine-written summary

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

> Flask-CORS versions before 6.0.0 are affected. The source says the library decodes URL paths in a way that turns '+' into a space, so CORS settings may fail to match the intended endpoints, which can allow unintended cross-origin access or block valid requests. The source gives few details on the exact conditions an attacker needs. Upgrade flask-cors to version 6.0.0 or later.

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

- 5.3 Medium, CVSS 3.0: `CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`, from CNA (@huntr_ai)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0032, the 25th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:34 UTC: First seen by agentprime
- 31 Oct 2026, 14:34 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-8vgw-p6qm-5gr7)

## Sources

- [GitHub Advisory Database: GHSA-8vgw-p6qm-5gr7](https://github.com/advisories/GHSA-8vgw-p6qm-5gr7)
- [OSV: GHSA-8vgw-p6qm-5gr7](https://osv.dev/vulnerability/GHSA-8vgw-p6qm-5gr7)
- <https://nvd.nist.gov/vuln/detail/CVE-2024-6844>
- <https://github.com/corydolphin/flask-cors/commit/35d875319621bd129a38b2b823abf4a2f6cda536>
- <https://github.com/corydolphin/flask-cors>
- <https://github.com/corydolphin/flask-cors/blob/main/flask_cors/extension.py#L193>
- <https://huntr.com/bounties/731a6cd4-d05f-4fe6-8f5b-fe088d7b34e0>
- <https://lists.debian.org/debian-lts-announce/2025/05/msg00049.html>

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-8vgw-p6qm-5gr7>, 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-8vgw-p6qm-5gr7/>. Everything for agents: <https://agentprime.io/llms.txt>.