CVE-2026-25602

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-25602
StatePUBLISHED
AssignerENISA
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-20 11:16:26 UTC
Updated2026-09-25 15:17:54 UTC
DescriptionInsufficient Verification of Data Authenticity in the feedback function of Mesalvo MEONA (MEONA Client and MEONA Server). The MEONA Client transmits the recipient address of a feedback report to the MEONA Server, and the server sends the report to the transmitted address instead of the address configured on the server. The feedback function is available only in the MEONA administration area, which requires one of the administrative roles ADMINISTRATOR, SUPERADMINISTRATOR or TYPIST (catalogue editing), or the PHARMACIST role holding the PHARMACY_ADMINISTRATOR right, assigned explicitly by the operating hospital's administrators. Such a user who modifies the client request can cause the MEONA Server to send a message with content of the user's choosing, from the sender address configured on the server, to a recipient of the user's choosing, within the limits permitted by the operator's mail relay. The message can be used for social engineering because it appears to originate from an internal hospital system. Exploitation requires a MEONA account with one of the administrative roles named above and access to the operating hospital's internal network; MEONA is operated exclusively within closed hospital networks without exposure to the public Internet, and where a hospital permits remote access to that network at all, it is only through the hospital's own remote-access infrastructure (e.g. VPN) under the hospital's control. The message contains only the recipient, subject and text entered by the user; no data of other users or patients is disclosed. Mesalvo is not aware of any exploitation outside the reported security test. This issue affects MEONA Client and MEONA Server in versions 2024.10, 2025.04 (before 2025.04.24) and 2026.03 (before 2026.03.02). MEONA 2025.04.24 and 2026.03.02 (planned Q4 2026) enforce the configured recipient address on the server. Operators can restrict at their mail relay which recipients the MEONA sender address may reach.

Risk And Classification

Primary CVSS: v3.1 2.3 LOW from a6d3dc9e-0591-4a13-bce7-0f5b31ff6158

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

EPSS: 0.000920000 probability, percentile 0.005030000 (date 2026-09-27)

Problem Types: CWE-345 | CWE-345 CWE-345: Insufficient Verification of Data Authenticity

VersionSourceTypeScoreSeverityVector
3.1a6d3dc9e-0591-4a13-bce7-0f5b31ff6158Secondary2.3LOWCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
3.1CNACVSS2.3LOWCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mesalvo Meona Server affected 2024.10 custom Not specified
CNA Mesalvo Meona Server affected 2025.04 2025.04.24 custom Not specified
CNA Mesalvo Meona Server affected 2026.03 2026.03.02 custom Not specified
CNA Mesalvo Meona Client affected 2024.10 custom Not specified
CNA Mesalvo Meona Client affected 2025.04 2025.04.24 custom Not specified
CNA Mesalvo Meona Client affected 2026.03 2026.03.02 custom Not specified

References

ReferenceSourceLinkTags
mesalvo.com/en/vdp/advisories/msa-2026-005.pdf a6d3dc9e-0591-4a13-bce7-0f5b31ff6158 mesalvo.com
seccore.at/blog/cves-meona MITRE seccore.at
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: MEONA 2025.04.24 and 2026.03.02 (planned Q4 2026) enforce the configured recipient address on the MEONA Server and ignore any client-supplied recipient.

Workarounds

CNA: Operators can restrict, at their mail relay, the recipients that the MEONA sender address (e.g. noreply-meona-…) may reach to the configured feedback mailbox, or to internal domains, and monitor messages from that sender address to other recipients. Details: Mesalvo Security Advisory MSA-2026-005.

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