A bug in Nextcloud Server 17.0.1 causes the workflow rules to depend their behaviour on the file extension when checking file mimetypes.

published 2020-02-04 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-6570

cvss: 8.0; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits: 0; none known

Patch / fix

fixed in 1 distros 1 links 1

nextcloud nextcloud_server 15.0.14, 16.0.7, 17.0.2

nextcloud Package Hub 15 SP1 15.0.14-bp151.3.6.1
nextcloud Package Hub 15 SP1, Package Hub 15, Package Hub 12 +1 more 15.0.14-bp151.3.3.1

opensuse advisories openSUSE-SU-2020:0229-1 openSUSE-SU-2020:0220-1

hackerone.com/reports/697959 advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-15613 updated 2025-11-21

nextcloud: Several CVEs fixed in nextcloud 15, 16 and 17

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.13% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.0	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	6.0	AV:N/AC:M/Au:S/C:P/I:P/A:P

Affected products

n/a Nextcloud Server

Classification

Weakness

CWE-20 Improper Input Validation
CWE-345 Insufficient Verification of Data Authenticity

References

hackerone.com /reports/697959
patch, third-party-advisory
lists.opensuse.org /opensuse-security-announce/2020-02/msg00019.html
vendor-advisory, mailing-list, third-party-advisory
lists.opensuse.org /opensuse-security-announce/2020-02/msg00022.html
vendor-advisory, mailing-list, third-party-advisory
nextcloud.com /security/advisory/?id=NC-SA-2020-002
broken-link, vendor-advisory

Sources

CVE List CVE-2019-15613
NVD CVE-2019-15613

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary