How severe is CVE-2025-27134?

CVE-2025-27134 has a CVSS 3.x base score of 8.8, 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 high, and availability high.

Is CVE-2025-27134 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-27134?

CVE-2025-27134 affects Joplin Project Joplin. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-27134?

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-2025-27134 have an EU (EUVD) identifier?

Yes. CVE-2025-27134 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14844.

When was CVE-2025-27134 published?

CVE-2025-27134 was published on 2025-04-30 and last updated on 2026-06-17.

CVE-2025-27134

CVE-2025-27134 is a high-severity vulnerability in Joplin Project Joplin with a CVSS 3.x base score of 8.8. 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-284.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-14844
Weakness: CWE-284
Affected product: Joplin Project Joplin
Published: 2025-04-30
Last modified: 2026-06-17

Description

Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. Prior to version 3.3.3, a privilege escalation vulnerability exists in the Joplin server, allowing non-admin users to exploit the API endpoint `PATCH /api/users/:id` to set the `is_admin` field to 1. The vulnerability allows malicious low-privileged users to perform administrative actions without proper authorization. This issue has been patched in version 3.3.3.

Frequently asked questions

What is CVE-2025-27134?: Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. Prior to version 3.3.3, a privilege escalation vulnerability exists in the Joplin server, allowing non-admin users to exploit the API endpoint `PATCH /api/users/:id` to set the `is_admin` field to 1. The vulnerability allows malicious low-privileged users to perform administrative actions without proper authorization. This issue has been patched in version 3.3.3.
How severe is CVE-2025-27134?: CVE-2025-27134 has a CVSS 3.x base score of 8.8, 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 high, and availability high.
Is CVE-2025-27134 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-27134?: CVE-2025-27134 affects Joplin Project Joplin. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-27134?: 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-2025-27134 have an EU (EUVD) identifier?: Yes. CVE-2025-27134 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14844.
When was CVE-2025-27134 published?: CVE-2025-27134 was published on 2025-04-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:joplin_project:joplin:*:*:*:*:*:-:*:*

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