What is CVE-2019-25337?

CVE-2019-25337 is a critical-severity vulnerability in Owncloud, classified under Observable Discrepancy. CVSS score: 9.8/10. Published 2026-02-12.

How severe is CVE-2019-25337?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Owncloud

CVE-2019-25337

OwnCloud 8.1.8 contains a username enumeration vulnerability that allows remote attackers to discover user accounts by manipulating the share.php endpoint. Attackers can send crafted GET requests to /index.php/core/ajax/share.php with a wi…

EPSS: 0.004 (32.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Owncloud — versions 8.1.8

Weakness classification (CWE)

CWE-203 — Observable Discrepancy

References

disclosure@vulncheck.com (exploit)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2019-25337?: CVE-2019-25337 is a critical-severity vulnerability in Owncloud, classified under Observable Discrepancy. CVSS score: 9.8/10. Published 2026-02-12.
How severe is CVE-2019-25337?: Critical severity. CVSS v3 base score is 9.8 out of 10.