What is CVE-2020-8297?

CVE-2020-8297 is a medium-severity vulnerability in Nextcloud Deck, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2021-02-23.

How severe is CVE-2020-8297?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Nextcloud Deck

CVE-2020-8297

Nextcloud Deck before 1.0.2 suffers from an insecure direct object reference (IDOR) vulnerability that permits users with a duplicate user identifier to access deck data of a previous deleted user.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2021-02-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.013 (70.3th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Nextcloud Deck
Nextcloud Deck — versions Fixed in 1.0.2

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

hackerone.com/reports/882258 (Exploit, Third Party Advisory)
nextcloud.com/security/advisory/ (Broken Link)
github.com/nextcloud/deck/pull/1976 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-8297?: CVE-2020-8297 is a medium-severity vulnerability in Nextcloud Deck, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2021-02-23.
How severe is CVE-2020-8297?: Medium severity. CVSS v3 base score is 4.3 out of 10.