Description

A vulnerability was found in SiteServer SSCMS 7.4.0. Affected by this issue is some unknown functionality of the component Agent Installation Workflow. Performing a manipulation of the argument SecurityKey results in improper access controls. Remote exploitation of the attack is possible. The attack is considered to have high complexity. The exploitation is known to be difficult. The project was informed of the problem early through an issue report but has not responded yet.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.0",
  "pubDate": "2026-08-30T10:17:14.843Z",
  "pubdate": "2026-08-30T10:17:14.843Z",
  "executiveSummary": "A critical security vulnerability has been identified in SiteServer SSCMS version 7.4.0, specifically within the Agent Installation Workflow component.\nThe vulnerability manifests as an improper access control flaw, potentially allowing unauthorized entities to bypass security constraints by manipulating the SecurityKey argument.\nThis flaw facilitates remote exploitation, though the attack is characterized by high complexity and technical difficulty, requiring a sophisticated understanding of the underlying application logic.\nThe successful exploitation of this vulnerability poses a significant risk to the integrity and confidentiality of the affected SSCMS deployment, as it enables unauthorized interaction with the Agent Installation Workflow.\nDespite being notified, the vendor has not provided a resolution, necessitating proactive defensive measures by system administrators to prevent potential unauthorized access.\nThe attack vector is remote, placing systems exposed to the network at potential risk of unauthorized procedural manipulation.",
  "technicalDetails": "The vulnerability resides within the Agent Installation Workflow component of SiteServer SSCMS 7.4.0, specifically relating to the server-side validation of the SecurityKey parameter.\nThe root cause is an insufficient validation mechanism or a complete lack of authorization checks during the interaction with the aforementioned workflow component, allowing for the unauthorized manipulation of security parameters.\nIn a typical attack scenario, a remote attacker targets the Agent Installation interface. By supplying a maliciously crafted or manipulated SecurityKey argument, the attacker attempts to influence the internal logic of the workflow process.\nBecause the system fails to adequately verify the authenticity and scope of the provided SecurityKey, the application may inadvertently grant the requester access to privileged operations or administrative workflow states that should be restricted to authenticated administrators.\nThe exploitation process is characterized as highly complex. This suggests that the SecurityKey may be subject to internal hashing, time-based tokens, or obfuscated derivation logic that the attacker must reverse-engineer or otherwise bypass to successfully inject the payload.\nThe attack flow involves the following steps: (1) Reconnaissance of the SSCMS Agent Installation Workflow interface to identify input vectors; (2) Analysis of the expected format and validation logic of the SecurityKey; (3) Crafting a payload that circumvents access control constraints; (4) Submitting the manipulated SecurityKey to the targeted endpoint to initiate the unauthorized workflow execution.\nPost-exploitation impact may include the unauthorized installation of rogue agents or the illicit modification of site-wide configurations that the Agent Installation Workflow governs. The lack of proper authorization logic ensures that once the initial validation barrier is bypassed, the attacker can execute workflow commands with unintended privileges.\nGiven that the application does not appear to enforce secondary, robust authorization checks on the server-side following the initial key verification, the vulnerability remains a significant concern for environments where the installation workflow is reachable over the network."
}