How severe is CVE-2019-5476?

CVE-2019-5476 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-2019-5476 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-5476?

CVE-2019-5476 affects Nextcloud Lookup-server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-5476?

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.

When was CVE-2019-5476 published?

CVE-2019-5476 was published on 2019-08-07 and last updated on 2026-06-17.

CVE-2019-5476

CVE-2019-5476 is a critical-severity vulnerability in Nextcloud Lookup-server 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-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Nextcloud Lookup-server
Published: 2019-08-07
Last modified: 2026-06-17

Description

An SQL Injection in the Nextcloud Lookup-Server < v0.3.0 (running on https://lookup.nextcloud.com) caused unauthenticated users to be able to execute arbitrary SQL commands.

Frequently asked questions

What is CVE-2019-5476?: An SQL Injection in the Nextcloud Lookup-Server < v0.3.0 (running on https://lookup.nextcloud.com) caused unauthenticated users to be able to execute arbitrary SQL commands.
How severe is CVE-2019-5476?: CVE-2019-5476 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-2019-5476 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-5476?: CVE-2019-5476 affects Nextcloud Lookup-server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-5476?: 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.
When was CVE-2019-5476 published?: CVE-2019-5476 was published on 2019-08-07 and last updated on 2026-06-17.

References

https://hackerone.com/reports/508487

Affected products (1)

cpe:2.3:a:nextcloud:lookup-server:*:*:*:*:*:*:*:*

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