How severe is CVE-2026-40471?

CVE-2026-40471 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability low.

Is CVE-2026-40471 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-40471?

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-2026-40471 have an EU (EUVD) identifier?

Yes. CVE-2026-40471 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25234.

When was CVE-2026-40471 published?

CVE-2026-40471 was published on 2026-04-23 and last updated on 2026-06-17.

CVE-2026-40471

CVE-2026-40471 is a critical-severity vulnerability with a CVSS 3.x base score of 9.6. 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: Critical (CVSS 3.x base score 9.6)
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25234
Weakness: CWE-352
Published: 2026-04-23
Last modified: 2026-06-17

Description

hackage-server lacked Cross-Site Request Forgery (CSRF) protection across its endpoints. Scripts on foreign sites could trigger requests to hackage server, possibly abusing latent credentials to upload packages or perform other administrative actions. Some unauthenticated actions could also be abused (e.g. creating new user accounts).

Frequently asked questions

What is CVE-2026-40471?: hackage-server lacked Cross-Site Request Forgery (CSRF) protection across its endpoints. Scripts on foreign sites could trigger requests to hackage server, possibly abusing latent credentials to upload packages or perform other administrative actions. Some unauthenticated actions could also be abused (e.g. creating new user accounts).
How severe is CVE-2026-40471?: CVE-2026-40471 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability low.
Is CVE-2026-40471 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-40471?: 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-2026-40471 have an EU (EUVD) identifier?: Yes. CVE-2026-40471 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25234.
When was CVE-2026-40471 published?: CVE-2026-40471 was published on 2026-04-23 and last updated on 2026-06-17.

References

https://osv.dev/vulnerability/HSEC-2026-0002

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