How severe is CVE-2026-39371?

CVE-2026-39371 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2026-39371 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39371?

CVE-2026-39371 primarily affects Redwoodjs Redwoodsdk. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-39371?

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

Does CVE-2026-39371 have an EU (EUVD) identifier?

Yes. CVE-2026-39371 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19888.

When was CVE-2026-39371 published?

CVE-2026-39371 was published on 2026-04-07 and last updated on 2026-06-17.

CVE-2026-39371

CVE-2026-39371 is a high-severity vulnerability in Redwoodjs Redwoodsdk with a CVSS 3.x base score of 8.1. 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-352.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19888
Weakness: CWE-352
Affected product: Redwoodjs Redwoodsdk
Published: 2026-04-07
Last modified: 2026-06-17

Description

RedwoodSDK is a server-first React framework. From 1.0.0-beta.50 to 1.0.5, erver functions exported from "use server" files could be invoked via GET requests, bypassing their intended HTTP method. In cookie-authenticated applications, this allowed cross-site GET navigations to trigger state-changing functions, because browsers send SameSite=Lax cookies on top-level GET requests. This affected all server functions -- both serverAction() handlers and bare exported functions in "use server" files. This vulnerability is fixed in 1.0.6.

Frequently asked questions

What is CVE-2026-39371?: RedwoodSDK is a server-first React framework. From 1.0.0-beta.50 to 1.0.5, erver functions exported from "use server" files could be invoked via GET requests, bypassing their intended HTTP method. In cookie-authenticated applications, this allowed cross-site GET navigations to trigger state-changing functions, because browsers send SameSite=Lax cookies on top-level GET requests. This affected all server functions -- both serverAction() handlers and bare exported functions in "use server" files. This vulnerability is fixed in 1.0.6.
How severe is CVE-2026-39371?: CVE-2026-39371 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2026-39371 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39371?: CVE-2026-39371 primarily affects Redwoodjs Redwoodsdk. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-39371?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-39371 have an EU (EUVD) identifier?: Yes. CVE-2026-39371 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19888.
When was CVE-2026-39371 published?: CVE-2026-39371 was published on 2026-04-07 and last updated on 2026-06-17.

References

https://github.com/redwoodjs/sdk/security/advisories/GHSA-x8rx-789c-2pxq

Affected products (11)

cpe:2.3:a:redwoodjs:redwoodsdk:*:*:*:*:*:*:*:*
cpe:2.3:a:redwoodjs:redwoodsdk:1.0.0:beta50:*:*:*:*:*:*
cpe:2.3:a:redwoodjs:redwoodsdk:1.0.0:beta51:*:*:*:*:*:*
cpe:2.3:a:redwoodjs:redwoodsdk:1.0.0:beta52:*:*:*:*:*:*
cpe:2.3:a:redwoodjs:redwoodsdk:1.0.0:beta53:*:*:*:*:*:*
cpe:2.3:a:redwoodjs:redwoodsdk:1.0.0:beta53_test20260205213024:*:*:*:*:*:*
cpe:2.3:a:redwoodjs:redwoodsdk:1.0.0:beta54:*:*:*:*:*:*
cpe:2.3:a:redwoodjs:redwoodsdk:1.0.0:beta55:*:*:*:*:*:*
cpe:2.3:a:redwoodjs:redwoodsdk:1.0.0:beta56:*:*:*:*:*:*
cpe:2.3:a:redwoodjs:redwoodsdk:1.0.0:beta57:*:*:*:*:*:*
cpe:2.3:a:redwoodjs:redwoodsdk:1.0.0:beta58:*:*:*:*:*:*

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