How severe is CVE-2023-28997?

CVE-2023-28997 has a CVSS 3.x base score of 6.7, rated medium severity. It is exploitable over physical access with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2023-28997 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-28997?

CVE-2023-28997 affects Nextcloud Desktop. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-28997?

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

When was CVE-2023-28997 published?

CVE-2023-28997 was published on 2023-04-04 and last updated on 2026-06-17.

CVE-2023-28997

CVE-2023-28997 is a medium-severity vulnerability in Nextcloud Desktop with a CVSS 3.x base score of 6.7. 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-323.

Key facts

Severity: Medium (CVSS 3.x base score 6.7)
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-323
Affected product: Nextcloud Desktop
Published: 2023-04-04
Last modified: 2026-06-17

Description

The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can recover and modify the contents of end-to-end encrypted files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.

Frequently asked questions

What is CVE-2023-28997?: The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can recover and modify the contents of end-to-end encrypted files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.
How severe is CVE-2023-28997?: CVE-2023-28997 has a CVSS 3.x base score of 6.7, rated medium severity. It is exploitable over physical access with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2023-28997 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-28997?: CVE-2023-28997 affects Nextcloud Desktop. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-28997?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-28997 published?: CVE-2023-28997 was published on 2023-04-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nextcloud:desktop:*:*:*:*:*:*:*:*

More vulnerabilities in Nextcloud Desktop

CVE-2024-46958 — Critical (CVSS 9.1): In Nextcloud Desktop Client 3.13.1 through 3.13.3 on Linux, synchronized files (between the server and client) may…
CVE-2021-22879 — High (CVSS 8.8): Nextcloud Desktop Client prior to 3.1.3 is vulnerable to resource injection by way of missing validation of URLs,…
CVE-2020-8224 — High (CVSS 7.8): A code injection in Nextcloud Desktop Client 2.6.4 allowed to load arbitrary code when placing a malicious OpenSSL…
CVE-2020-8225 — High (CVSS 7.5): A cleartext storage of sensitive information in Nextcloud Desktop Client 2.6.4 gave away information about used proxies…
CVE-2021-37617 — High (CVSS 7.3): The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with a computer. The Nextcloud…
CVE-2023-28999 — Medium (CVSS 6.9): Nextcloud is an open-source productivity platform. In Nextcloud Desktop client 3.0.0 until 3.8.0, Nextcloud Android app…

All CVEs affecting Nextcloud Desktop →

Other CWE-323 vulnerabilities

CVE-2026-59099 — Critical (CVSS 9.1): Apereo CAS 7.3.0 before 8.0.0-RC6 contains a cryptographic vulnerability that allows remote unauthenticated attackers…
CVE-2026-12205 — Critical (CVSS 9.1): Crypt::DSA versions before 1.21 for Perl reused the nonce across signatures, leading to private-key…
CVE-2026-49952 — Critical (CVSS 9.1): Discuz! X5.0 releases 20260320 through 20260501 contains an authentication bypass vulnerability that allows…
CVE-2025-64767 — Critical (CVSS 9.1): hpke-js is a Hybrid Public Key Encryption (HPKE) module built on top of Web Cryptography API. Prior to version 1.7.5,…
CVE-2025-47345 — High (CVSS 8.4): Cryptographic issue may occur while encrypting license data.
CVE-2026-3559 — High (CVSS 8.1): Philips Hue Bridge HomeKit Accessory Protocol Static Nonce Authentication Bypass Vulnerability. This vulnerability…

Browse all CWE-323 vulnerabilities →