fbeta ePA3-Service-OpenSource up to 1.2.x app/vau/VAUProtokoll.py build_inner_header injection

Summaryinfo

A vulnerability identified as critical has been detected in fbeta ePA3-Service-OpenSource up to 1.2.x. This affects the function build_inner_header of the file app/vau/VAUProtokoll.py. This manipulation of the argument uri/host/accept_type/content_type/content_length/USER_AGENT/insurant_id causes injection. This vulnerability is registered as CVE-2026-50576. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability has been found in fbeta ePA3-Service-OpenSource up to 1.2.x and classified as critical. Affected by this vulnerability is the function build_inner_header of the file app/vau/VAUProtokoll.py. The manipulation of the argument uri/host/accept_type/content_type/content_length/USER_AGENT/insurant_id with an unknown input leads to a injection vulnerability. The CWE definition for the vulnerability is CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

ePA 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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-50576 since 06/04/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1055 according to MITRE ATT&CK.

Upgrading to version 1.3.0 eliminates this vulnerability.

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Productinfo

Vendor

• fbeta

Name

• ePA3-Service-OpenSource

Version

• 1.0
• 1.1
• 1.2

License

• open-source

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CPE 2.2info

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