How severe is CVE-2023-28848?

CVE-2023-28848 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2023-28848 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-28848?

CVE-2023-28848 affects Nextcloud User Oidc. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-28848?

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

When was CVE-2023-28848 published?

CVE-2023-28848 was published on 2023-04-04 and last updated on 2026-06-17.

CVE-2023-28848

CVE-2023-28848 is a medium-severity vulnerability in Nextcloud User Oidc with a CVSS 3.x base score of 4.8. 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-352.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Nextcloud User Oidc
Published: 2023-04-04
Last modified: 2026-06-17

Description

user_oidc is the OIDC connect user backend for Nextcloud, an open source collaboration platform. A vulnerability in versions 1.0.0 until 1.3.0 effectively allowed an attacker to bypass the state protection as they could just copy the expected state token from the first request to their second request. Users should upgrade user_oidc to 1.3.0 to receive a patch for the issue. No known workarounds are available.

Frequently asked questions

What is CVE-2023-28848?: user_oidc is the OIDC connect user backend for Nextcloud, an open source collaboration platform. A vulnerability in versions 1.0.0 until 1.3.0 effectively allowed an attacker to bypass the state protection as they could just copy the expected state token from the first request to their second request. Users should upgrade user_oidc to 1.3.0 to receive a patch for the issue. No known workarounds are available.
How severe is CVE-2023-28848?: CVE-2023-28848 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2023-28848 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-28848?: CVE-2023-28848 affects Nextcloud User Oidc. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-28848?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-28848 published?: CVE-2023-28848 was published on 2023-04-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nextcloud:user_oidc:*:*:*:*:*:*:*:*

More vulnerabilities in Nextcloud User Oidc

CVE-2023-32074 — High (CVSS 8.0): user_oidc app is an OpenID Connect user backend for Nextcloud. Authentication can be broken/bypassed in user_oidc app.…
CVE-2024-37312 — Medium (CVSS 6.3): user_oidc app is an OpenID Connect user backend for Nextcloud. Missing access control on the ID4me endpoint allows an…
CVE-2024-37886 — Medium (CVSS 5.4): user_oidc app is an OpenID Connect user backend for Nextcloud. An attacker could potentially trick the app into…
CVE-2023-39953 — Medium (CVSS 4.8): user_oidc provides the OIDC connect user backend for Nextcloud, an open-source cloud platform. Starting in version…
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CVE-2023-39954 — Low (CVSS 3.8): user_oidc provides the OIDC connect user backend for Nextcloud, an open-source cloud platform. Starting in version…

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