How severe is CVE-2026-35056?

CVE-2026-35056 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-35056 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35056?

CVE-2026-35056 affects Xenforo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35056?

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-2026-35056 have an EU (EUVD) identifier?

Yes. CVE-2026-35056 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17743.

When was CVE-2026-35056 published?

CVE-2026-35056 was published on 2026-04-01 and last updated on 2026-06-17.

CVE-2026-35056

CVE-2026-35056 is a high-severity vulnerability in Xenforo with a CVSS 3.x base score of 7.2. 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-94.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v4: 8.6
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17743
Weakness: CWE-94
Affected product: Xenforo
Published: 2026-04-01
Last modified: 2026-06-17

Description

XenForo before 2.3.9 and before 2.2.18 allows remote code execution (RCE) by authenticated, but malicious, admin users. An attacker with admin panel access can execute arbitrary code on the server.

Frequently asked questions

What is CVE-2026-35056?: XenForo before 2.3.9 and before 2.2.18 allows remote code execution (RCE) by authenticated, but malicious, admin users. An attacker with admin panel access can execute arbitrary code on the server.
How severe is CVE-2026-35056?: CVE-2026-35056 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-35056 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35056?: CVE-2026-35056 affects Xenforo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35056?: 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-2026-35056 have an EU (EUVD) identifier?: Yes. CVE-2026-35056 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17743.
When was CVE-2026-35056 published?: CVE-2026-35056 was published on 2026-04-01 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Xenforo

CVE-2025-71279 — Critical (CVSS 9.8): XenForo before 2.3.7 contains a security issue affecting Passkeys that have been added to user accounts. An attacker…
CVE-2025-71281 — High (CVSS 8.8): XenForo before 2.3.7 does not properly restrict methods callable from within templates. A loose prefix match was used…
CVE-2025-71278 — High (CVSS 8.8): XenForo before 2.3.5 allows OAuth2 client applications to request unauthorized scopes. This affects any customer using…
CVE-2024-38458 — High (CVSS 8.8): Xenforo before 2.2.16 allows code injection.
CVE-2024-38457 — High (CVSS 8.8): Xenforo before 2.2.16 allows CSRF.
CVE-2024-25006 — High (CVSS 8.1): XenForo before 2.2.14 allows Directory Traversal (with write access) by an authenticated user who has permissions to…

All CVEs affecting Xenforo →

Other CWE-94 (Code Injection) vulnerabilities

CVE-2026-57624 — Critical (CVSS 10.0): Unauthenticated Remote Code Execution (RCE) in Blocksy Companion Pro <= 2.1.46 versions.
CVE-2026-10134 — Critical (CVSS 10.0): IBM Langflow OSS 1.0.0 through 1.9.3 allows an attacker to read every secret available to the Langflow process, read…
CVE-2026-53576 — Critical (CVSS 10.0): Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, the authentication filter…
CVE-2026-10561 — Critical (CVSS 10.0): IBM Langflow OSS 1.0.0 through 1.9.3 has an vulnerability due to an improper isolation of Python execution combined…
CVE-2026-25470 — Critical (CVSS 10.0): Improper Control of Generation of Code ('Code Injection') vulnerability in ACPT ACPT (Pro) - Custom Post Types Plugin…
CVE-2026-48836 — Critical (CVSS 10.0): Unauthenticated Remote Code Execution (RCE) in Easy Invoice <= 2.1.19 versions.

Browse all CWE-94 (Code Injection) vulnerabilities →