epa4all-client has a VAU Signature bypass
### Impact In SignedPublicKeysTrustValidatorImpl.isTrusted(), the ECDSA signature verification at line 45 discards the boolean return value of Signature.verify(). The method performs certificate chain validation, OCSP check, and signature algorithm setup, but never checks whether the signature actually matches. For any structurally valid signature,...
CVSS 8.1 MEDIUM. SENTINEL APEX recommends immediate patch evaluation. Intelligence from 1 confirmed source(s).
📋 Executive Summary
This report analyzes CVE-2026-44900 affecting maven com.oviva.telematik:epa4all-client. Composite threat score: 50/100. Intelligence corroborated across 1 source(s): github_advisories. CVSS base score: 8.1. No confirmed in-the-wild exploitation at the time of writing; prioritize on exposure, privilege, and CVSS.
⚠️ Business Impact Analysis
- ⚠️ Remote code execution — full server takeover without authentication possible
🔗 Representative Attack Path
A typical attack path for this vulnerability class, mapped to MITRE ATT&CK — a representative model to guide detection and defense, not a claim of observed activity against a specific target. Confirm specifics against the primary sources below.
| # | Phase | Attacker Action | MITRE |
|---|---|---|---|
1 |
Reconnaissance | Attacker identifies exposed com.oviva.telematik:epa4all-client instances via Shodan, Censys, or targeted scanning | TA0043 |
2 |
Initial Access | Exploitation of CVE-2026-44900 in maven com.oviva.telematik:epa4all-client | T1190 |
3 |
Execution | Remote code execution achieved — attacker runs arbitrary commands on target system | T1203 |
4 |
Persistence | Backdoor, scheduled task, or new admin account created for persistent access | T1053 |
5 |
Command & Control | Attacker establishes persistent C2 channel using HTTPS or DNS tunneling | T1071 |
6 |
Impact / Objectives | Intellectual property theft, espionage, cryptomining, or preparation for future attack stage | T1657 |
⚠ Deep Dive Analysis
This high-severity vulnerability in maven com.oviva.telematik:epa4all-client (CVSS 8.1) represents a significant attack surface. SENTINEL APEX assesses exploitation to be technically feasible with moderate effort. Organizations running com.oviva.telematik:epa4all-client in internet-facing or privileged positions face immediate risk.
SENTINEL APEX URGENCY: HIGH. Score: 50/100 MEDIUM. Patch before exploitation activity begins.
🎯 MITRE ATT&CK Mapping
| Category | Mapping |
|---|---|
| Primary Tactic | Execution |
| Primary Technique | T1203 — Exploitation for Client Execution |
| Sub-Technique | T1059 — Command & Scripting Interpreter |
| Weakness (CWE) | CWE-295 |
| Intel Type | 🔴 CVE ANALYSIS |
| Source(s) | github_advisories |
🔴 CVE Reference
| CVE ID | Reference | Score |
|---|---|---|
| CVE-2026-44900 | NVD → | 8.1 |
| CVE-2026-44900 | NVD → | 8.1 |
🏷️ Indicators of Compromise — Enriched IOC Feed
Normalized IOCs with confidence scoring. Block immediately across all enforcement points. SOC Pro subscribers receive enriched IOC bundles with full attribution and STIX/TAXII feeds.
| Indicator Value | Type | Confidence | First Seen |
|---|---|---|---|
| https://github.com/oviva-ag/epa4all-client/pull/34). | url | 82% | 2026-05-09 |
| https://www.machinespirits.com/advisory/d76aec/) | url | 82% | 2026-05-09 |
| https://machinespirits.com) | url | 82% | 2026-05-09 |
| www.machinespirits.com | domain | 75% | 2026-05-09 |
| machinespirits.com | domain | 75% | 2026-05-09 |
🔍 Detection Rules — Sigma (SIEM)
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📡 Detection Rules — YARA (Endpoint)
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🛡️ SOC Response Playbook
- 1IMMEDIATE (0-1hr): Identify all instances of com.oviva.telematik:epa4all-client in your environment via CMDB/asset inventory
- 2IMMEDIATE: Block all 5 IOCs in this report at firewall, proxy, DNS, and EDR simultaneously
- 3IMMEDIATE (0-1hr): Apply vendor patch — no maintenance window exception for MEDIUM threats
- 4IMMEDIATE (1-2hr): If no patch available: implement WAF rules, ACLs, or network-level compensating controls
- 5SHORT-TERM (2-4hr): Deploy Sigma detection rule to SIEM — validate alert generation in test environment
- 6SHORT-TERM (4-8hr): Review logs for exploitation indicators (anomalous com.oviva.telematik:epa4all-client requests, error spikes)
- 7SHORT-TERM (8-24hr): Hunt for post-exploitation: new admin accounts, scheduled tasks, lateral movement
- 8MONITOR: Subscribe to maven security advisories for patch updates
- 9ONGOING: Track SENTINEL APEX intelligence feed for follow-on campaigns targeting com.oviva.telematik:epa4all-client
📎 Intelligence References
- github.com/advisories/GHSA-g8r3-5hwf-qp96
- github.com/oviva-ag/epa4all-client/security/advisories/GHSA-g8r3-5hwf-
- github.com/oviva-ag/epa4all-client/pull/34
- www.machinespirits.com/advisory/d76aec
- github.com/advisories/GHSA-g8r3-5hwf-qp96
- 📌 NVD — CVE-2026-44900
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Report ID: SENTINEL-CVE-2026-44900-2026-05-09 | Priority: 50/100 MEDIUM | Sources: 1
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