How severe is CVE-2019-5455?

CVE-2019-5455 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-5455 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-5455?

CVE-2019-5455 affects Nextcloud. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-5455?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-5455 published?

CVE-2019-5455 was published on 2019-07-30 and last updated on 2026-06-17.

CVE-2019-5455

CVE-2019-5455 is a medium-severity vulnerability in Nextcloud with a CVSS 3.x base score of 6.8. 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-287.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
CVSS v2: 4.6
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Nextcloud
Published: 2019-07-30
Last modified: 2026-06-17

Description

Bypassing lock protection exists in Nextcloud Android app 3.6.0 when creating a multi-account and aborting the process.

Frequently asked questions

What is CVE-2019-5455?: Bypassing lock protection exists in Nextcloud Android app 3.6.0 when creating a multi-account and aborting the process.
How severe is CVE-2019-5455?: CVE-2019-5455 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-5455 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-5455?: CVE-2019-5455 affects Nextcloud. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-5455?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-5455 published?: CVE-2019-5455 was published on 2019-07-30 and last updated on 2026-06-17.

References

https://hackerone.com/reports/490946

Affected products (1)

cpe:2.3:a:nextcloud:nextcloud:3.6.0:*:*:*:*:android:*:*

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Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-59500 — Critical (CVSS 10.0): CWE-287: Improper Authentication
CVE-2024-27253 — Critical (CVSS 10.0): IBM DOORS Next 7.0.3 through 7.0.3 Interim Fix 018 could allow an authenticated user to bypass security logic to…
CVE-2026-56162 — Critical (CVSS 10.0): Improper authentication in Azure SQL Database allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-62825 — Critical (CVSS 10.0): Improper authentication in Azure Key Vault allows an unauthorized attacker to elevate privileges over a network.

Browse all CWE-287 (Improper Authentication) vulnerabilities →