Listen to this Post
The vulnerability CVE-2026-3422 resides in the U-Office Force software developed by e-Excellence. It is an Insecure Deserialization flaw, specifically mapped to CWE-502 . Deserialization is the process of converting a stream of bytes back into an object for use by an application. This vulnerability arises because the application deserializes data from incoming requests without proper validation or sanitization. An unauthenticated attacker can exploit this by sending a specially crafted, malicious serialized object to the server . When the server’s deserialization mechanism processes this untrusted data, it can instantiate objects and set their properties based on the attacker’s input. This can lead to the execution of arbitrary code if the deserialization process triggers methods within the application’s classes that perform dangerous operations. The attack requires no privileges and no user interaction, and it has a low attack complexity, making it highly dangerous . The successful exploit grants the attacker the ability to execute arbitrary code on the server, leading to a full compromise of confidentiality, integrity, and availability . The official solution is to update to version 29.50SP1 or later .
Platform: U-Office Force
Version: 29.50 and earlier
Vulnerability: Insecure Deserialization
Severity: Critical
date: 2026-03-02
Prediction: Patch immediately
What Undercode Say:
Analytics
The vulnerability scoring is critical. NVD provides a CVSS v4.0 score of 9.3 , while TWCERT/CC’s own analysis assigns a CVSS v3.1 base score of 9.8 . The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) confirms the attack is over the network, requires no privileges or user interaction, and has a high impact on all three security objectives. The EPSS score is currently 0.0040 (04/03/2026), indicating a low probability of exploitation in the wild within the next 30 days, though this can change rapidly once exploits are developed . The vulnerability was discovered by Ting-Wei Hsieh and Chih-Chiang Tseng of CHT Security .
How Exploit:
Exploitation involves crafting a malicious serialized payload. While a public PoC is not yet available, the attack would involve identifying a class in U-Office Force’s classpath that performs dangerous actions in its `readObject()` (Java) or `__destruct()` (PHP) methods. The attacker would serialize an instance of this “gadget” class with attacker-controlled properties and send it to the vulnerable endpoint.
Example of generating a malicious Java serialized object (ysoserial tool) java -jar ysoserial-all.jar CommonsCollections1 'calc.exe' > payload.bin The attacker would then send this payload to the vulnerable U-Office Force endpoint curl -X POST -H "Content-Type: application/x-java-serialized-object" --data-binary @payload.bin http://target-uoffice.com/vulnerable/endpoint
The vulnerable application would then deserialize this data, triggering the gadget chain and executing the attacker’s command.
Protection from this CVE
- Patch Immediately: Upgrade to U-Office Force version 29.50SP1 or later, as released by the vendor .
- Input Validation: If patching is not immediately possible, implement a Web Application Firewall (WAF) rule to inspect and block requests containing known Java serialization headers (
AC ED 00 05in hex or `rO0` in base64) on endpoints known to handle this functionality. - Deserialization Controls: Apply look-ahead object input stream validation to prevent deserialization of untrusted classes if source code access is available.
- Network Segmentation: Restrict network access to the U-Office Force server, allowing only trusted internal IPs to connect until the patch is applied.
Impact
A successful exploit allows an unauthenticated remote attacker to achieve Remote Code Execution (RCE) on the underlying server. This grants the attacker complete control over the server, enabling them to install backdoors, create persistent access, pivot to internal network resources, and exfiltrate, encrypt, or destroy all data within the U-Office Force database and file system. The business impact is a total compromise of the affected system’s confidentiality, integrity, and availability . This could halt all office automation processes, leading to significant operational disruption and potential data breach notification requirements.
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
