CVE-2024-6844 | Inconsistent CORS Matching Due to Handling of '+' in URL Path in corydolphin/flask-cors

Exp

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.

Published: 2025-03-20 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-6844 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.27%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2024-6844

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2024-6844

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.11% 0.27% +0.16%
2 2026-04-29 0.17% 0.11% -0.06%
3 2026-04-28 — 0.17% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-6844

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]

Weakness enumeration for CVE-2024-6844

GitHub Security Advisory for CVE-2024-6844

GHSA-8vgw-p6qm-5gr7 · Severity: medium · Ecosystem: pip — Flask-CORS allows for inconsistent CORS matching

OS Trackers for CVE-2024-6844

vendor priority summary link
debian not yet assigned CVE-2024-6844 not yet assigned priority: Debian including 1 source packages (python-flask-cors), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2024-6844
ubuntu medium CVE-2024-6844 medium priority: Ubuntu including 1 source packages (python-flask-cors), 7 status rows across 7 suites (focal, jammy, noble, oracular, plucky, questing, upstream): released 6, not-affected 1. https://ubuntu.com/security/CVE-2024-6844

Affected software / configurations for CVE-2024-6844

Vendor Product Version Raw CPE
flask-cors_project flask-cors 4.0.1 cpe:2.3:a:flask-cors_project:flask-cors:4.0.1:*:*:*:*:*:*:*

References for CVE-2024-6844

cvelogic Threat Intelligence