CVE-2026-40242 Scanner

Arcane is a software product that is utilized primarily by developers and companies focused on templating operations or other web-based functionalities. It provides API endpoints to facilitate interaction with templates and is especially known for its flexibility in template manipulation. Its user base includes web development agencies, enterprises facilitating document processing, and potentially any industry leveraging templates for bulk operations. Primarily, Arcane aims to ease the task of template management by bringing automation and user-friendly interfaces into the workflow. The product finds its usage across different levels of industries, including small-scale businesses and larger enterprises needing streamlined document processes. Arcane's essential purpose revolves around improving efficiency in handling document templates for various operational needs.

The Server-Side Request Forgery (SSRF) vulnerability allows a remote attacker to manipulate a server into sending unauthorized requests. Malicious actors could exploit this vulnerability to force a server to connect with internal systems or third-party resources controlled by the attacker without authentication. This particular vulnerability in Arcane arises due to inadequate validation of URL schemes and host names within the /api/templates/fetch endpoint. SSRF is especially concerning in systems with sensitive internal networks as it can break through security boundaries by redirecting internal server communications. SSRF is notorious for being leveraged in a variety of attack scenarios to probe and exploit services accessible from the vulnerable server. The attacker needs no particular prerequisites to attempt exploitation.

The SSRF vulnerability in Arcane versions up to 1.17.2 is due to the lack of sufficient validation of URL schemes and the host provided to the /api/templates/fetch endpoint. Attackers can craft requests that force the server to fetch resources from arbitrary locations as specified by them. Specifically, the vulnerability is within the HTTP GET operation, where unvalidated URLs can be interpreted and executed by the server leading maliciously constructed HTTP requests. The absence of this validation permits external manipulation of what should be a controlled network interaction, effectively bridging into contexts unintended for external exposure. Addressing this requires both input validation and probably a whitelisting mechanism to only allow trusted resources to be queried by the server under normal operations.

The primary risk of exploiting the SSRF vulnerability lies in the server communicating with potentially malicious endpoints, leading to unauthorized data exposure or other network manipulations. Attackers might exploit this flaw to scan internal networks, execute unauthorized actions, or extract sensitive information from normally inaccessible resources. This could result in data theft, further injection of malicious scripts or code into the system, and compromising network integrity. If an SSRF attack is successful, it can have a cascading effect on other systems dependent on the vulnerable server's operations, thus expanding the scope and impact of the security breach. Companies relying on Arcane might suffer from reputation damage and potential financial consequences stemming from these vulnerabilities.

REFERENCES

• https://github.com/getarcaneapp/arcane/security/advisories/GHSA-ff24-4prj-gpmj
• https://nvd.nist.gov/vuln/detail/CVE-2026-40242