ePA 3.x Integration: HTTP Header Injection in VAU Inner Requests

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-50576
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-18 17:16:58 UTC
Updated2026-08-18 20:17:16 UTC
DescriptionePA 3.x Integration implements the authorization workflow and writes Medical Information Objects to Germany's electronic patient record. Prior to 1.3.0, ePA 3.x Integration does not neutralize CRLF characters in values used by app/vau/VAUProtokoll.py to construct VAU inner HTTP requests. The build_inner_header function interpolates the uri, host, accept_type, content_type, content_length, USER_AGENT, and insurant_id values into request lines and headers, including x-useragent and x-insurantid. An authenticated attacker who controls a value can inject additional headers into the inner request. Depending on ePA server handling, an injected x-insurantid header can expose another patient's records, and injected Authorization headers can bypass the intended authentication or authorization context. Session-derived USER_AGENT input can also poison requests across the session. This issue is fixed in version 1.3.0.

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Problem Types: CWE-113 | CWE-113 CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED6.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Fbeta-GmbH EPA3-Service-OpenSource affected < 1.3.0 Not specified

References

ReferenceSourceLinkTags
github.com/fbeta-GmbH/ePA3-Service-OpenSource/commit/b984d15d261423302de... [email protected] github.com
github.com/fbeta-GmbH/ePA3-Service-OpenSource/releases/tag/1.3.0 [email protected] github.com
github.com/fbeta-GmbH/ePA3-Service-OpenSource/security/advisories/GHSA-j... [email protected] github.com
github.com/fbeta-GmbH/ePA3-Service-OpenSource/pull/11 [email protected] github.com
www.machinespirits.de/advisory/013a60 [email protected] www.machinespirits.de
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