How severe is CVE-2019-25337?

CVE-2019-25337 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-25337 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2019-25337?

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-2019-25337 have an EU (EUVD) identifier?

Yes. CVE-2019-25337 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-19573.

When was CVE-2019-25337 published?

CVE-2019-25337 was published on 2026-02-12 and last updated on 2026-06-17.

CVE-2019-25337

CVE-2019-25337 is a critical-severity vulnerability with a CVSS 3.x base score of 9.8. 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-203.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 5.3
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2019-19573
Weakness: CWE-203
Published: 2026-02-12
Last modified: 2026-06-17

Description

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 wildcard search parameter to retrieve comprehensive user information.

Frequently asked questions

What is 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 wildcard search parameter to retrieve comprehensive user information.
How severe is CVE-2019-25337?: CVE-2019-25337 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-25337 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2019-25337?: 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-2019-25337 have an EU (EUVD) identifier?: Yes. CVE-2019-25337 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-19573.
When was CVE-2019-25337 published?: CVE-2019-25337 was published on 2026-02-12 and last updated on 2026-06-17.

References

Other CWE-203 (Observable Discrepancy) vulnerabilities

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