CVE-2026-0857

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-0857
StatePUBLISHED
AssignerENISA
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-20 11:16:25 UTC
Updated2026-09-25 15:17:51 UTC
DescriptionUse of a Password Hash With Insufficient Computational Effort in Mesalvo MEONA (MEONA Server and MEONA Client) for user accounts whose password was last set under a version before MEONA 2024.10. MEONA versions before 2024.10 protected stored passwords with SHA-1 (versions from October 2015) or stored them without protection (earlier versions). Since MEONA 2024.10 (June 2024) Argon2 is the default method and every password that is set or changed is stored with Argon2; passwords last set under an earlier version keep the earlier method until they are changed. An administrator could in addition select the storage method per account. A MEONA super administrator can read the stored value of such accounts in the user administration of the MEONA Client or export it through administrative database functions. Only accounts managed locally in MEONA are affected; accounts authenticated through the operating hospital's directory service (Active Directory / Entra ID) have no password stored in MEONA. In typical installations end users authenticate through the directory service and local accounts are limited to emergency and technical accounts. Exploitation requires super administrator permissions in MEONA (or direct access to the MEONA database) from within the operating hospital's 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. Installations in which every password has been set or changed under MEONA 2024.10 or later are not affected. Mesalvo is not aware of any exploitation outside the reported security test. This issue affects MEONA Server and MEONA Client in versions 2024.10, 2025.04 and 2026.03 (for accounts with passwords last set under earlier versions). MEONA 2025.04.24 and 2026.03.02 (planned Q4 2026) remove the legacy storage methods, require every affected account to set a new Argon2-protected password at next logon, and no longer display stored credential values in the user administration. See Mesalvo Security Advisory MSA-2026-002.

Risk And Classification

Primary CVSS: v3.1 4.4 MEDIUM from a6d3dc9e-0591-4a13-bce7-0f5b31ff6158

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

EPSS: 0.001010000 probability, percentile 0.008320000 (date 2026-09-27)

Problem Types: CWE-916 | CWE-916 CWE-916 Use of password hash with insufficient computational effort

VersionSourceTypeScoreSeverityVector
3.1a6d3dc9e-0591-4a13-bce7-0f5b31ff6158Secondary4.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
3.1CNACVSS4.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
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
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

References

ReferenceSourceLinkTags
mesalvo.com/en/vdp/advisories/msa-2026-002.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 (Q4 2026) remove the legacy password storage methods, require every account whose password is still stored with a legacy method to set a new Argon2-protected password at next logon, and remove the display of stored credential values from the user administration.

Workarounds

CNA: Until the service packs are installed, administrators can force a password change for accounts whose password was last set under a version before MEONA 2024.10; the new password is stored with Argon2.  Installations in which every password has been set or changed under MEONA 2024.10 or later are not affected. Details: Mesalvo Security Advisory MSA-2026-002.

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