Insecure Deserialization in WebITR Enables Authenticated RCE

WebITR developed by Uniong has a Insecure Deserialization vulnerability. Authenticated remote attackers can use the hard-coded cryptographic key to craft and submit malicious serialized data, thereby executing arbitrary code on the server.

Casky was already ahead

This CVE exploits attack patterns that Casky's 447matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

WebITR by Uniong contains a critical insecure deserialization vulnerability (CWE-502) that allows authenticated remote attackers to execute arbitrary code on affected servers. The vulnerability stems from the application's use of a hard-coded cryptographic key to process serialized data without proper validation. While authentication is required as a prerequisite, this significantly lowers the barrier to exploitation since the attacker only needs valid credentials—potentially obtained through phishing, credential stuffing, or insider access. Any organization deploying WebITR is affected, particularly those with legacy systems where credential compromise may go undetected for extended periods.

Casky's 447 mapped skills leverage Claude's extended reasoning to identify the attack chain behind this vulnerability across MITRE ATT&CK techniques: TA0001 (Initial Access), TA0043 (Reconnaissance), and TA0002 (Execution). Practitioners using Casky would detect suspicious patterns including unusual serialized object submissions post-authentication, anomalous process execution following deserialization operations, and lateral movement attempts originating from the WebITR service account. The platform's skills enable detection of both the reconnaissance phase (attackers probing for serialization endpoints), the exploitation attempt (crafted malicious payloads leveraging the known hard-coded key), and post-exploitation indicators like unexpected child processes or outbound connections from the WebITR application context—providing comprehensive visibility into the full attack lifecycle.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

447 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-113404.

Abuse of Public-Facing API: Mobile API Abuse

mobile security · low

Run

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

MITRE ATT&CK Techniques

TA0001 TA0043 TA0002

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