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Vulnerabilities CVE-2026-48021

CVE-2026-48021

Critical
Open
TLP:CLEAR

epa4all Security Incident: Implement keystore based on Telematik TSL, implement hostname check and certificate check for lib-vau

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Description

In epa4all, prior to version 2026-05-20, an attacker who can intercept the TLS connection between epa4all and the ePA backend can complete the VAU handshake with attacker-controlled keys and obtain the session encryption keys. All inner HTTP traffic (patient consent decisions, medication data, document operations, authorization tokens, and entitlement queries) becomes readable and modifiable. The attacker can also inject arbitrary requests through the hijacked channel. This issue has been patched in version 2026-05-20.

Details

CVSS Score
9.1
EPSS Score
0.12%

2.5th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Confidence
90%
Published
Jul 24, 2026
Last Modified
Jul 25, 2026
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