How severe is CVE-2025-59305?

CVE-2025-59305 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.

Is CVE-2025-59305 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-59305?

CVE-2025-59305 affects Langfuse. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-59305?

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-2025-59305 have an EU (EUVD) identifier?

Yes. CVE-2025-59305 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-31045.

When was CVE-2025-59305 published?

CVE-2025-59305 was published on 2025-09-24 and last updated on 2026-06-17.

CVE-2025-59305

CVE-2025-59305 is a high-severity vulnerability in Langfuse with a CVSS 3.x base score of 7.6. 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-285.

Key facts

Severity: High (CVSS 3.x base score 7.6)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-31045
Weakness: CWE-285
Affected product: Langfuse
Published: 2025-09-24
Last modified: 2026-06-17

Description

Improper authorization in the background migration endpoints of Langfuse 3.1 before d67b317 allows any authenticated user to invoke migration control functions. This can lead to data corruption or denial of service through unauthorized access to TRPC endpoints such as backgroundMigrations.all, backgroundMigrations.status, and backgroundMigrations.retry.

Frequently asked questions

What is CVE-2025-59305?: Improper authorization in the background migration endpoints of Langfuse 3.1 before d67b317 allows any authenticated user to invoke migration control functions. This can lead to data corruption or denial of service through unauthorized access to TRPC endpoints such as backgroundMigrations.all, backgroundMigrations.status, and backgroundMigrations.retry.
How severe is CVE-2025-59305?: CVE-2025-59305 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.
Is CVE-2025-59305 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-59305?: CVE-2025-59305 affects Langfuse. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-59305?: 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-2025-59305 have an EU (EUVD) identifier?: Yes. CVE-2025-59305 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-31045.
When was CVE-2025-59305 published?: CVE-2025-59305 was published on 2025-09-24 and last updated on 2026-06-17.

References

https://depthfirst.com/post/how-an-authorization-flaw-reveals-a-common-security-blind-spot-cve-2025-59305-case-study

Affected products (1)

cpe:2.3:a:langfuse:langfuse:*:*:*:*:*:*:*:*

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