How severe is CVE-2024-56140?

CVE-2024-56140 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity high, and availability none.

Is CVE-2024-56140 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-56140?

CVE-2024-56140 affects Astro. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-56140?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-56140 have an EU (EUVD) identifier?

Yes. CVE-2024-56140 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-3575.

When was CVE-2024-56140 published?

CVE-2024-56140 was published on 2024-12-18 and last updated on 2026-06-17.

CVE-2024-56140

CVE-2024-56140 is a medium-severity vulnerability in Astro with a CVSS 3.x base score of 5.9. 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-352.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-3575
Weakness: CWE-352
Affected product: Astro
Published: 2024-12-18
Last modified: 2026-06-17

Description

Astro is a web framework for content-driven websites. In affected versions a bug in Astro’s CSRF-protection middleware allows requests to bypass CSRF checks. When the `security.checkOrigin` configuration option is set to `true`, Astro middleware will perform a CSRF check. However, a vulnerability exists that can bypass this security. A semicolon-delimited parameter is allowed after the type in `Content-Type`. Web browsers will treat a `Content-Type` such as `application/x-www-form-urlencoded; abc` as a `simple request` and will not perform preflight validation. In this case, CSRF is not blocked as expected. Additionally, the `Content-Type` header is not required for a request. This issue has been addressed in version 4.16.17 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

Frequently asked questions

What is CVE-2024-56140?: Astro is a web framework for content-driven websites. In affected versions a bug in Astro’s CSRF-protection middleware allows requests to bypass CSRF checks. When the `security.checkOrigin` configuration option is set to `true`, Astro middleware will perform a CSRF check. However, a vulnerability exists that can bypass this security. A semicolon-delimited parameter is allowed after the type in `Content-Type`. Web browsers will treat a `Content-Type` such as `application/x-www-form-urlencoded; abc` as a `simple request` and will not perform preflight validation. In this case, CSRF is not blocked as expected. Additionally, the `Content-Type` header is not required for a request. This issue has been addressed in version 4.16.17 and all users are advised to upgrade. There are no known workarounds for this vulnerability.
How severe is CVE-2024-56140?: CVE-2024-56140 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity high, and availability none.
Is CVE-2024-56140 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-56140?: CVE-2024-56140 affects Astro. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-56140?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-56140 have an EU (EUVD) identifier?: Yes. CVE-2024-56140 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-3575.
When was CVE-2024-56140 published?: CVE-2024-56140 was published on 2024-12-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:astro:astro:*:*:*:*:*:node.js:*:*

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