How severe is CVE-2023-49104?

CVE-2023-49104 has a CVSS 3.x base score of 8.7, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2023-49104 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-49104?

CVE-2023-49104 affects Owncloud Oauth2. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-49104?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-49104 published?

CVE-2023-49104 was published on 2023-11-21 and last updated on 2026-06-17.

CVE-2023-49104

CVE-2023-49104 is a high-severity vulnerability in Owncloud Oauth2 with a CVSS 3.x base score of 8.7. 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-601.

Key facts

Severity: High (CVSS 3.x base score 8.7)
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-601
Affected product: Owncloud Oauth2
Published: 2023-11-21
Last modified: 2026-06-17

Description

An issue was discovered in ownCloud owncloud/oauth2 before 0.6.1, when Allow Subdomains is enabled. An attacker is able to pass in a crafted redirect-url that bypasses validation, and consequently allows an attacker to redirect callbacks to a Top Level Domain controlled by the attacker.

Frequently asked questions

What is CVE-2023-49104?: An issue was discovered in ownCloud owncloud/oauth2 before 0.6.1, when Allow Subdomains is enabled. An attacker is able to pass in a crafted redirect-url that bypasses validation, and consequently allows an attacker to redirect callbacks to a Top Level Domain controlled by the attacker.
How severe is CVE-2023-49104?: CVE-2023-49104 has a CVSS 3.x base score of 8.7, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2023-49104 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-49104?: CVE-2023-49104 affects Owncloud Oauth2. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-49104?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-49104 published?: CVE-2023-49104 was published on 2023-11-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:owncloud:oauth2:*:*:*:*:*:*:*:*

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