How severe is CVE-2024-27456?

CVE-2024-27456 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2024-27456 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-27456?

CVE-2024-27456 affects Rylabs Rack Cors Middleware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-27456?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2024-27456 have an EU (EUVD) identifier?

Yes. CVE-2024-27456 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0551.

When was CVE-2024-27456 published?

CVE-2024-27456 was published on 2024-02-26 and last updated on 2026-06-17.

CVE-2024-27456

CVE-2024-27456 is a critical-severity vulnerability in Rylabs Rack Cors Middleware with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-0551
Weakness: CWE-200
Affected product: Rylabs Rack Cors Middleware
Published: 2024-02-26
Last modified: 2026-06-17

Description

rack-cors (aka Rack CORS Middleware) 2.0.1 has 0666 permissions for the .rb files.

Frequently asked questions

What is CVE-2024-27456?: rack-cors (aka Rack CORS Middleware) 2.0.1 has 0666 permissions for the .rb files.
How severe is CVE-2024-27456?: CVE-2024-27456 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2024-27456 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-27456?: CVE-2024-27456 affects Rylabs Rack Cors Middleware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-27456?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2024-27456 have an EU (EUVD) identifier?: Yes. CVE-2024-27456 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0551.
When was CVE-2024-27456 published?: CVE-2024-27456 was published on 2024-02-26 and last updated on 2026-06-17.

References

https://github.com/cyu/rack-cors/issues/274

Affected products (1)

cpe:2.3:a:rylabs:rack_cors_middleware:2.0.1:*:*:*:*:*:*:*

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