How severe is CVE-2026-47899?

CVE-2026-47899 has a CVSS 4.0 base score of 8.7, rated high severity.

Is CVE-2026-47899 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-2026-47899?

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-2026-47899 have an EU (EUVD) identifier?

Yes. CVE-2026-47899 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35436.

When was CVE-2026-47899 published?

CVE-2026-47899 was published on 2026-06-09 and last updated on 2026-06-17.

CVE-2026-47899

CVE-2026-47899 is a high-severity vulnerability with a CVSS 4.0 base score of 8.7. 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-749.

Key facts

Severity: High (CVSS 4.0 base score 8.7)
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-35436
Weakness: CWE-749
Published: 2026-06-09
Last modified: 2026-06-17

Description

The Electron preload script in Logseq exposes an API method that allows the renderer process to invoke IPC handlers without proper path validation. An attacker with JavaScript execution in the renderer (e.g. via XSS or a malicious plugin), can read, write, or delete arbitrary files on the user's system. While only version v0.10.15 was tested and confirmed as vulnerable, status of other versions is unknown since this issue was not addressed by a patch.

Frequently asked questions

What is CVE-2026-47899?: The Electron preload script in Logseq exposes an API method that allows the renderer process to invoke IPC handlers without proper path validation. An attacker with JavaScript execution in the renderer (e.g. via XSS or a malicious plugin), can read, write, or delete arbitrary files on the user's system. While only version v0.10.15 was tested and confirmed as vulnerable, status of other versions is unknown since this issue was not addressed by a patch.
How severe is CVE-2026-47899?: CVE-2026-47899 has a CVSS 4.0 base score of 8.7, rated high severity.
Is CVE-2026-47899 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-2026-47899?: 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-2026-47899 have an EU (EUVD) identifier?: Yes. CVE-2026-47899 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35436.
When was CVE-2026-47899 published?: CVE-2026-47899 was published on 2026-06-09 and last updated on 2026-06-17.

References

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