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TI-2024-06346 Aliases CVE-2024-6844GHSA-8vgw-p6qm-5gr7

Inconsistent CORS Matching Due to Handling of '+' in URL Path in corydolphin/flask-cors

Priority MEDIUM 63CWE-346Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-346.

Summary

A vulnerability in corydolphin/flask-cors version 4.0.1 allows for inconsistent CORS matching due to the handling of the '+' character in URL paths. The request.path is passed through the unquote_plus function, which converts the '+' character to a space ' '. This behavior leads to incorrect path normalization, causing potential mismatches in CORS configuration. As a result, endpoints may not be matched correctly to their CORS settings, leading to unexpected CORS policy application. This can cause unauthorized cross-origin access or block valid requests, creating security vulnerabilities and usability issues.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00319 25th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed flask-cors (PyPI): 6.0.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
corydolphincorydolphin/flask-corsup to latest—No fix listedCNA
—flask-cors (PyPI)before 6.0.06.0.0Patch availableGHSA-8vgw-p6qm-5gr7
  • corydolphin/flask-cors Vendorcorydolphin Affected up to latest Fixed in — No fix listed CNA
  • flask-cors (PyPI) Vendor— Affected before 6.0.0 Fixed in 6.0.0 Patch available GHSA-8vgw-p6qm-5gr7

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:flask-cors_project:flask-cors:4.0.1:*:*:*:*:*:*:*4.0.1VulnerableFlask-cors Project
  • cpe:2.3:a:flask-cors_project:flask-cors:4.0.1:*:*:*:*:*:*:* Versions 4.0.1 Vulnerable ·Flask-cors Project

Remediation

  • Fix · GHSA-8vgw-p6qm-5gr7 flask-cors (PyPI) Fixed in 6.0.0 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-6844
  2. 2026-10-03 Alias added: GHSA-8vgw-p6qm-5gr7

References

Exploit 1

Advisory 1

Other 4

  • TI-2024-06367 Case-Insensitive Path Matching in corydolphin/flask-cors CVSS 3.1HIGH 7.5
  • TI-2024-05769 Improper Access Control in corydolphin/flask-cors CVSS 3.1HIGH 7.5
  • TI-2024-01562 Log Injection Vulnerability in corydolphin/flask-cors CVSS 3.1MEDIUM 5.3
  • TI-2024-06341 Improper Regex Path Matching in corydolphin/flask-cors CVSS 3.1MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences