Deserialization of Untrusted Data Affecting devcode-it/openstamanager package, versions <2.10.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published5 Apr 2026
- disclosed1 Apr 2026
- creditormzro
Introduced: 1 Apr 2026
CVE-2026-29782 (opens in a new tab)How to fix?
Upgrade devcode-it/openstamanager to version 2.10.2 or higher.
Overview
devcode-it/openstamanager is a management software for technical assistance and electronic invoicing
Affected versions of this package are vulnerable to Deserialization of Untrusted Data in the unserialize process of the access_token field in the OAuth2 configuration flow, where attacker-controlled serialized data can be injected into the database and later deserialized without class restrictions. An attacker can execute arbitrary commands on the server as the web application user by first injecting a malicious serialized object into the database (for example, via a separate SQL injection vulnerability) and then triggering the deserialization through an unauthenticated request to the OAuth2 endpoint. This is only exploitable if the attacker is able to write arbitrary data to the relevant database field, such as by leveraging another vulnerability that allows database modification.
Workaround
This vulnerability can be mitigated by restricting the allowed classes in the unserialize process or by replacing PHP serialization with a safer alternative such as JSON encoding/decoding.
Details
Serialization is a process of converting an object into a sequence of bytes which can be persisted to a disk or database or can be sent through streams. The reverse process of creating object from sequence of bytes is called deserialization. Serialization is commonly used for communication (sharing objects between multiple hosts) and persistence (store the object state in a file or a database). It is an integral part of popular protocols like Remote Method Invocation (RMI), Java Management Extension (JMX), Java Messaging System (JMS), Action Message Format (AMF), Java Server Faces (JSF) ViewState, etc.
Deserialization of untrusted data (CWE-502) is when the application deserializes untrusted data without sufficiently verifying that the resulting data will be valid, thus allowing the attacker to control the state or the flow of the execution.