本ページは nextcloud nextcloud_server に影響する公開済み CVE（NVD の CPE 経由で関連付け）を列挙します。各行に深刻度指標・概要・公開日が含まれます。
| CVE | 概要 | ソース | CVSS 最大値 | EPSS（%） | 公開 | 更新 |
|---|---|---|---|---|---|---|
| CVE-2021-32653 | Nextcloud Server is a Nextcloud package that handles data storage. Nextcloud Server versions prior to 19.0.11, 20.0.10, or 21.0.2 send user IDs to the lookup server even if the user has no fields set to published. The vulnerability is patched in versions 19.0.11, 20.0.10, and 21.0.2; no workarounds outside the updates are known to exist. | [email protected] | 2.7 | 1.21% | 2021-06-01 | 2026-06-16 |
| CVE-2021-22878 | Nextcloud Server prior to 20.0.6 is vulnerable to reflected cross-site scripting (XSS) due to lack of sanitization in `OC.Notification.show`. | [email protected] | 4.8 | 1.06% | 2021-03-03 | 2026-06-16 |
| CVE-2021-22877 | A missing user check in Nextcloud prior to 20.0.6 inadvertently populates a user's own credentials for other users external storage configuration when not already configured yet. | [email protected] | 6.5 | 1.69% | 2021-03-03 | 2026-06-16 |
| CVE-2020-8296 | Nextcloud Server prior to 20.0.0 stores passwords in a recoverable format even when external storage is not configured. | [email protected] | 6.7 | 0.51% | 2021-03-03 | 2026-06-16 |
| CVE-2020-8294 | A missing link validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows execution of a stored XSS attack using Internet Explorer when saving a 'javascript:' URL in markdown format. | [email protected] | 5.4 | 0.90% | 2021-02-03 | 2026-06-16 |
| CVE-2020-8295 | A wrong check in Nextcloud Server 19 and prior allowed to perform a denial of service attack when resetting the password for a user. | [email protected] | 7.5 | 1.81% | 2021-01-26 | 2026-06-16 |
| CVE-2020-8293 | 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. | [email protected] | 6.5 | 1.56% | 2021-01-26 | 2026-06-16 |
| CVE-2020-8259 | Insufficient protection of the server-side encryption keys in Nextcloud Server 19.0.1 allowed an attacker to replace the encryption keys. | [email protected] | 8.1 | 0.73% | 2020-11-15 | 2026-06-16 |
| CVE-2020-8152 | Insufficient protection of the server-side encryption keys in Nextcloud Server 19.0.1 allowed an attacker to replace the public key to decrypt them later on. | [email protected] | 4.4 | 0.32% | 2020-11-15 | 2026-06-16 |
| CVE-2020-8150 | A cryptographic issue in Nextcloud Server 19.0.1 allowed an attacker to downgrade the encryption scheme and break the integrity of encrypted files. | [email protected] | 4.1 | 0.29% | 2020-11-09 | 2026-06-16 |
| CVE-2020-8133 | A wrong generation of the passphrase for the encrypted block in Nextcloud Server 19.0.1 allowed an attacker to overwrite blocks in a file. | [email protected] | 5.3 | 0.72% | 2020-11-09 | 2026-06-16 |
| CVE-2020-8236 | A wrong configuration in Nextcloud Server 19.0.1 incorrectly made the user feel the passwordless WebAuthn is also a two factor verification by asking for the PIN of the passwordless WebAuthn but not verifying it. | [email protected] | 6.8 | 0.58% | 2020-11-02 | 2026-06-16 |
| CVE-2020-8183 | A logic error in Nextcloud Server 19.0.0 caused a plaintext storage of the share password when it was given on the initial create API call. | [email protected] | 7.5 | 1.89% | 2020-11-02 | 2026-06-16 |
| CVE-2020-8173 | A too small set of random characters being used for encryption in Nextcloud Server 18.0.4 allowed decryption in shorter time than intended. | [email protected] | 2.2 | 0.36% | 2020-11-02 | 2026-06-16 |
| CVE-2020-8223 | A logic error in Nextcloud Server 19.0.0 caused a privilege escalation allowing malicious users to reshare with higher permissions than they got assigned themselves. | [email protected] | 6.5 | 1.45% | 2020-10-05 | 2026-06-16 |
| CVE-2020-8155 | An outdated 3rd party library in the Files PDF viewer for Nextcloud Server 18.0.2 caused a Cross-site scripting vulnerability when opening a malicious PDF. | [email protected] | 5.4 | 1.14% | 2020-05-12 | 2026-06-16 |
| CVE-2020-8154 | An Insecure direct object reference vulnerability in Nextcloud Server 18.0.2 allowed an attacker to remote wipe devices of other users when sending a malicious request directly to the endpoint. | [email protected] | 7.7 | 1.77% | 2020-05-12 | 2026-06-16 |
| CVE-2020-8139 | A missing access control check in Nextcloud Server < 18.0.1, < 17.0.4, and < 16.0.9 causes hide-download shares to be downloadable when appending /download to the URL. | [email protected] | 6.5 | 1.54% | 2020-03-20 | 2026-06-16 |
| CVE-2020-8138 | A missing check for IPv4 nested inside IPv6 in Nextcloud server < 17.0.1, < 16.0.7, and < 15.0.14 allowed a Server-Side Request Forgery (SSRF) vulnerability when subscribing to a malicious calendar URL. | [email protected] | 6.5 | 1.40% | 2020-03-20 | 2026-06-16 |
| CVE-2020-8122 | A missing check in Nextcloud Server 14.0.3 could give recipient the possibility to extend the expiration date of a share they received. | [email protected] | 4.3 | 0.68% | 2020-02-04 | 2026-06-16 |