How severe is CVE-2025-71278?

CVE-2025-71278 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-71278 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-71278?

CVE-2025-71278 affects Xenforo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-71278?

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.

Does CVE-2025-71278 have an EU (EUVD) identifier?

Yes. CVE-2025-71278 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-209150.

When was CVE-2025-71278 published?

CVE-2025-71278 was published on 2026-04-01 and last updated on 2026-06-17.

CVE-2025-71278

CVE-2025-71278 is a high-severity vulnerability in Xenforo with a CVSS 3.x base score of 8.8. 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-863.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 8.7
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-209150
Weakness: CWE-863
Affected product: Xenforo
Published: 2026-04-01
Last modified: 2026-06-17

Description

XenForo before 2.3.5 allows OAuth2 client applications to request unauthorized scopes. This affects any customer using OAuth2 clients on any version of XenForo 2.3 prior to 2.3.5, potentially allowing client applications to gain access beyond their intended authorization level.

Frequently asked questions

What is CVE-2025-71278?: XenForo before 2.3.5 allows OAuth2 client applications to request unauthorized scopes. This affects any customer using OAuth2 clients on any version of XenForo 2.3 prior to 2.3.5, potentially allowing client applications to gain access beyond their intended authorization level.
How severe is CVE-2025-71278?: CVE-2025-71278 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-71278 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-71278?: CVE-2025-71278 affects Xenforo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-71278?: 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.
Does CVE-2025-71278 have an EU (EUVD) identifier?: Yes. CVE-2025-71278 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-209150.
When was CVE-2025-71278 published?: CVE-2025-71278 was published on 2026-04-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:xenforo:xenforo:*:*:*:*:*:*:*:*

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