How severe is CVE-2019-5453?

CVE-2019-5453 has a CVSS 3.x base score of 6.1, 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 none.

Is CVE-2019-5453 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-5453?

CVE-2019-5453 primarily affects Nextcloud. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-5453?

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

When was CVE-2019-5453 published?

CVE-2019-5453 was published on 2019-07-30 and last updated on 2026-06-17.

CVE-2019-5453

CVE-2019-5453 is a medium-severity vulnerability in Nextcloud with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v2: 3.6
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Nextcloud
Published: 2019-07-30
Last modified: 2026-06-17

Description

Bypass lock protection in the Nextcloud Android app prior to version 3.3.0 allowed access to files when being prompted for the lock protection and switching to the Nextcloud file provider.

Frequently asked questions

What is CVE-2019-5453?: Bypass lock protection in the Nextcloud Android app prior to version 3.3.0 allowed access to files when being prompted for the lock protection and switching to the Nextcloud file provider.
How severe is CVE-2019-5453?: CVE-2019-5453 has a CVSS 3.x base score of 6.1, 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 none.
Is CVE-2019-5453 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-5453?: CVE-2019-5453 primarily affects Nextcloud. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-5453?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-5453 published?: CVE-2019-5453 was published on 2019-07-30 and last updated on 2026-06-17.

References

https://hackerone.com/reports/331489

Affected products (4)

cpe:2.3:a:nextcloud:nextcloud:*:*:*:*:*:android:*:*
cpe:2.3:a:nextcloud:nextcloud:3.3.0:rc1:*:*:*:android:*:*
cpe:2.3:a:nextcloud:nextcloud:3.3.0:rc2:*:*:*:android:*:*
cpe:2.3:a:nextcloud:nextcloud:3.3.0:rc3:*:*:*:android:*:*

More vulnerabilities in Nextcloud

CVE-2019-5454 — Critical (CVSS 9.8): SQL Injection in the Nextcloud Android app prior to version 3.0.0 allows to destroy a local cache when a harmful query…
CVE-2021-43863 — High (CVSS 7.5): The Nextcloud Android app is the Android client for Nextcloud, a self-hosted productivity platform. The Nextcloud…
CVE-2023-28999 — Medium (CVSS 6.9): Nextcloud is an open-source productivity platform. In Nextcloud Desktop client 3.0.0 until 3.8.0, Nextcloud Android app…
CVE-2019-5455 — Medium (CVSS 6.8): Bypassing lock protection exists in Nextcloud Android app 3.6.0 when creating a multi-account and aborting the process.
CVE-2019-5450 — Medium (CVSS 6.8): Improper sanitization of HTML in directory names in the Nextcloud Android app prior to version 3.7.0 allowed to style…
CVE-2021-22912 — Medium (CVSS 6.5): Nextcloud iOS before 3.4.2 suffers from an information disclosure vulnerability when searches for sharees utilize the…

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Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-45480 — Critical (CVSS 10.0): Improper authentication in Azure Active Directory allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →