Vulnerabilities

XenForo before 2.3.13 contains an unauthenticated authentication bypass (CWE-697) in its OAuth2 token endpoint, rated critical (CVSS 4.0: 9.1). The flaw arises from PHP truthy evaluation: when an attacker submits empty values for the client_secret and code_verifier parameters, the empty strings are treated as false and both client-secret validation and PKCE code-verifier validation are skipped entirely. As a result, an attacker who obtains a valid authorization code (for example by intercepting it during a legitimate redirect) can exchange it for a token pair without proving client identity or honoring the PKCE commitment, gaining access and refresh tokens with the high confidentiality and integrity impact reflected in the CVSS scoring. Only XenForo deployments running versions before 2.3.13 that expose the OAuth2 token endpoint (i.e., act as OAuth2 authorization servers) are affected. No in-the-wild exploitation is documented so far: one public proof-of-concept exists on GitHub, the issue is not in CISA's KEV catalog, and EPSS assigns a 0.5% probability of exploitation within 30 days.

Do: Upgrade to XenForo 2.3.13 or later. Until patched, add a mitigation that rejects empty client_secret and code_verifier values at the OAuth2 token endpoint (e.g., via WAF rule or code patch) and monitor for tokens issued without proper client authentication. Also review OAuth2 client configurations and recently issued tokens, and enforce strict redirect-URI and TLS hygiene, since the bypass matters most when authorization codes can be intercepted.

The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM or PVH guest does a grant table version change from v2 to v1 in parallel with mapping the status page(s) via XENMEM_add_to_physmap. Some of the status pages may then be freed while mappings of them would still be inserted into the guest's secondary (P2M) page tables.

The nexent v1.7.5.2 backend service contains an unauthorized arbitrary file deletion vulnerability in its ElasticSearch service interface. The DELETE /{index_name}/documents endpoint lacks proper authentication and authorization controls and does not validate the user-supplied path_or_url parameter. This allows unauthenticated remote attackers to send crafted requests that trigger the deletion of arbitrary documents from ElasticSearch indices and corresponding files from the MinIO storage system. Successful exploitation leads to data destruction and denial of service.

XenForo before 2.3.7 contains a security issue affecting Passkeys that have been added to user accounts. An attacker may be able to compromise the security of Passkey-based authentication.

The Intel EPT paging code uses an optimization to defer flushing of any cached EPT state until the p2m lock is dropped, so that multiple modifications done under the same locked region only issue a single flush. Freeing of paging structures however is not deferred until the flushing is done, and can result in freed pages transiently being present in cached state. Such stale entries can point to memory ranges not owned by the guest, thus allowing access to unintended memory regions.

Sync Breeze Enterprise 12.4.18 contains an unquoted service path vulnerability that allows local attackers to execute arbitrary code with elevated system privileges. Attackers can exploit the unquoted binary path by placing malicious executables in specific file system locations to hijack the service startup process.

Shadow mode tracing code uses a set of per-CPU variables to avoid cumbersome parameter passing. Some of these variables are written to with guest controlled data, of guest controllable size. That size can be larger than the variable, and bounding of the writes was missing.

Cross-Site request forgery (CSRF) vulnerability in Sync Breeze Enterprise Server v10.4.18 and Disk Pulse Enterprise v10.4.18. An authenticated user could cause another user to perform unwanted actions within the application they are logged into. This vulnerability is possible due to the lack of proper CSRF token implementation. Among other things, it is possible, using a POST request to delete all commands via '/delete_all_commands?sid='.

SyncBreeze 10.0.28 contains a denial of service vulnerability in the login endpoint that allows remote attackers to crash the service. Attackers can send an oversized payload in the login request to overwhelm the application and potentially disrupt service availability.

Disk Sorter Enterprise 13.6.12 contains an unquoted service path vulnerability in its Windows service configuration that allows local attackers to potentially execute arbitrary code. Attackers can exploit the unquoted path in 'C:\Program Files\Disk Sorter Enterprise\bin\disksrs.exe' to inject malicious executables and escalate privileges.

Sync Breeze 13.6.18 contains an unquoted service path vulnerability in its Windows service configuration that allows local attackers to potentially execute arbitrary code. Attackers can exploit the unquoted path in service binaries located in 'Program Files' directories to inject malicious executables and escalate privileges.

Dup Scout 13.5.28 contains an unquoted service path vulnerability in its Windows service configuration that allows local attackers to potentially execute arbitrary code. Attackers can exploit the unquoted path in 'C:\Program Files\Dup Scout Server\bin\dupscts.exe' to inject malicious executables and escalate privileges.

Disk Savvy 13.6.14 contains an unquoted service path vulnerability in its Windows service configuration that allows local attackers to potentially execute arbitrary code. Attackers can exploit the unquoted path in service binaries to inject malicious executables that will be run with elevated LocalSystem privileges.

SysGauge Server 7.9.18 contains an unquoted service path vulnerability in its binary path configuration that allows local attackers to potentially execute arbitrary code. Attackers can exploit the unquoted path in 'C:\Program Files\SysGauge Server\bin\sysgaus.exe' to inject malicious executables and escalate privileges.

DiskPulse Enterprise 13.6.14 contains an unquoted service path vulnerability in its Windows service configuration that allows local attackers to potentially execute arbitrary code. Attackers can exploit the unquoted path in 'C:\Program Files\Disk Pulse Enterprise\bin\diskpls.exe' to inject malicious executables and escalate privileges.