How severe is CVE-2020-8297?

CVE-2020-8297 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2020-8297 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-8297?

CVE-2020-8297 affects Nextcloud Deck. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-8297?

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

When was CVE-2020-8297 published?

CVE-2020-8297 was published on 2021-02-23 and last updated on 2026-06-17.

CVE-2020-8297

CVE-2020-8297 is a medium-severity vulnerability in Nextcloud Deck with a CVSS 3.x base score of 4.3. 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-639.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-639
Affected product: Nextcloud Deck
Published: 2021-02-23
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2020-8297?: CVE-2020-8297 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2020-8297 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-8297?: CVE-2020-8297 affects Nextcloud Deck. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-8297?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-8297 published?: CVE-2020-8297 was published on 2021-02-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*

More vulnerabilities in Nextcloud Deck

CVE-2021-39225 — High (CVSS 8.1): Nextcloud is an open-source, self-hosted productivity platform. A missing permission check in Nextcloud Deck before…
CVE-2020-8182 — High (CVSS 8.0): Improper access control in Nextcloud Deck 0.8.0 allowed an attacker to reshare boards shared with them with more…
CVE-2021-37631 — Medium (CVSS 6.5): Deck is an open source kanban style organization tool aimed at personal planning and project organization for teams…
CVE-2021-22913 — Medium (CVSS 6.5): Nextcloud Deck before 1.2.7, 1.4.1 suffers from an information disclosure vulnerability when searches for sharees…
CVE-2023-22469 — Medium (CVSS 5.8): Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with…
CVE-2025-66557 — Medium (CVSS 5.4): Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams…

All CVEs affecting Nextcloud Deck →

Other CWE-639 (Authorization Bypass Through User-Controlled Key (IDOR)) vulnerabilities

CVE-2025-40805 — Critical (CVSS 10.0): Affected devices do not properly enforce user authentication on specific API endpoints. This could facilitate an…
CVE-2024-45032 — Critical (CVSS 10.0): A vulnerability has been identified in Industrial Edge Management Pro (All versions < V1.9.5), Industrial Edge…
CVE-2026-34037 — Critical (CVSS 9.9): Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to…
CVE-2026-52782 — Critical (CVSS 9.9): OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, there is an IDOR through…
CVE-2026-45552 — Critical (CVSS 9.9): Roxy-WI is a web interface for managing Haproxy, Nginx, Apache and Keepalived servers. In versions 8.2.6.4 and prior,…
CVE-2026-29200 — Critical (CVSS 9.9): A critical IDOR vulnerability has been discovered in Comet Backup affecting all versions from 20.11.0 to 26.1.1 and…

Browse all CWE-639 (Authorization Bypass Through User-Controlled Key (IDOR)) vulnerabilities →