Description

Unauthenticated PHP Object Injection in Accalia <= 1.5.3 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-08-06T15:17:19.067Z",
  "pubdate": "2026-08-06T15:17:19.067Z",
  "executiveSummary": "An unauthenticated PHP Object Injection vulnerability has been identified in Accalia versions <= 1.5.3.\nThis security flaw arises from insecure deserialization practices within the application, allowing remote, unauthenticated threat actors to supply crafted serialized objects.\nSuccessful exploitation of this vulnerability can lead to severe security consequences, potentially enabling attackers to achieve arbitrary code execution, file deletion, or sensitive data access depending on the available gadget chains present within the application scope and its dependent libraries.\nThe risk implication is critical due to the lack of authentication requirements, meaning any external attacker with network access to the target web application can initiate exploitation payloads without prior privileges or system interaction.\nRemediation requires updating the affected product to a patched version or implementing strict input validation and secure deserialization controls within the PHP codebase.",
  "technicalDetails": "The vulnerability is categorized as PHP Object Injection, stemming from the insecure processing of untrusted input passed into deserialization functions such as unserialize() within the Accalia product.\nThe affected component resides in the codebase handling user-supplied parameters without proper sanitization or cryptographic signing, specifically targeting versions <= 1.5.3.\nBecause the attack vector is exposed over the network, an unauthenticated remote attacker can transmit a maliciously crafted HTTP request containing serialized PHP payload data.\nThe attack flow proceeds as follows: First, the attacker identifies an injection sink where user-supplied data is passed directly into a deserialization routine. Second, the attacker constructs a malicious serialized payload utilizing existing class definitions and destructor or wakeup magic methods present in the application context, commonly referred to as gadget chains. Third, the application processes the untrusted input and reconstructs the serialized objects into memory. Finally, during the object lifecycle manipulation or destruction phase, the embedded gadget chain executes arbitrary operations within the context of the web server process.\nThe privilege requirement for this attack is non-existent, as the endpoint exposed to the attacker requires no authentication credentials. The network exposure is broad, affecting any internet-facing deployment of the vulnerable software versions.\nPost-exploitation impact depends heavily on the available gadget chains within the PHP environment, ranging from remote code execution and Server-Side Request Forgery to arbitrary file read and write operations, entirely compromising the integrity and confidentiality of the underlying host."
}