CVE-2020-8293

Name: CVE-2020-8293
Creator: NVD / NIST
Published: 2021-01-26T18:16:08.507+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.56%

Last modified Jun 17, 2026

CVE-2020-8293 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. A missing input validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows users to store unlimited data in workflow rules causing load and potential DDoS on later interactions and usage with those rules.. EPSS estimates a 1.56% chance of exploitation in the next 30 days.

Description

A missing input validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows users to store unlimited data in workflow rules causing load and potential DDoS on later interactions and usage with those rules.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.56%

72.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nextcloud	Nextcloud Server	< 18.0.11
Nextcloud	Nextcloud Server	>= 19.0.0, < 19.0.5
Nextcloud	Nextcloud Server	>= 20.0.0, < 20.0.2

References

https://hackerone.com/reports/1018146Third Party Advisory
https://nextcloud.com/security/advisory/?id=NC-SA-2021-001Broken Link, Vendor Advisory
https://hackerone.com/reports/1018146Third Party Advisory
https://nextcloud.com/security/advisory/?id=NC-SA-2021-001Broken Link, Vendor Advisory

Timeline

Published: Jan 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-8293?

How severe is CVE-2020-8293?

CVE-2020-8293 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.56% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8293?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-8293?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST