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Vulnerabilities

Vulnerability · CVE-2026-35056

XenForo before 2.3.9 and before 2.2.18 allows remote code execution (RCE) by authenticated, but malicious, admin users.

Published Mar 30, 2026 · catalog updated Jun 17, 2026 · XenForo before 2.3.9 and

Patch now

CVE-2026-35056 is in the CISA known-exploited catalog. Confirm XenForo before 2.3.9 and against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (XenForo before 2.3.9 and).
  • No version range is stored. A customer cannot check an installed version against this record.
Severity
High8.6
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
0.90%
Remediation
Remediation guidance
Affected products
cpe xenforo/xenforo · vendor xenforo xenforo

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe xenforo/xenforoversion unspecified
  • vendor xenforo xenforoversion unspecified

How to fix CVE-2026-35056

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-35056 is in the CISA known-exploited catalog. Confirm XenForo before 2.3.9 and against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

CWE-94: Code Injection. EPSS 0.90%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 30, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  2. Apr 1, 2026 · NIST NVD

    Detected

    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.

  3. Jun 17, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-35056

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-35056

    30-day exploitation probability 0.9%

    first.org
  • NIST NVDVulnerability recordCVE-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.

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-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.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.