CVE-2026-0857 (GCVE-0-2026-0857)

Vulnerability from cvelistv5 – Published: 2026-05-20 10:50 – Updated: 2026-09-25 14:23
VLAI
Summary
Use 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.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-20 12:01 UTC
CWE
  • CWE-916 - Use of password hash with insufficient computational effort
References
Impacted products
Vendor Product Version
Mesalvo Meona Client Affected: 2024.10 (custom)
Affected: 2025.04 , < 2025.04.24 (custom)
Affected: 2026.03 , < 2026.03.02 (custom)
Create a notification for this product.
Mesalvo Meona Server Affected: 2024.10 (custom)
Affected: 2025.04 , < 2025.04.24 (custom)
Affected: 2026.03 , < 2026.03.02 (custom)
Create a notification for this product.
Show details on NVD website

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                  "value": "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."
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              "value": "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."
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "workarounds": [
            {
              "lang": "en",
              "supportingMedia": [
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                  "type": "text/html",
                  "value": "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.\u0026nbsp;\u003cbr\u003e\u003cbr\u003eInstallations 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."
                }
              ],
              "value": "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.\u00a0\n\nInstallations 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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      },
      "cveMetadata": {
        "assignerOrgId": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
        "assignerShortName": "ENISA",
        "cveId": "CVE-2026-0857",
        "datePublished": "2026-05-20T10:50:58.695Z",
        "dateReserved": "2026-01-12T06:14:14.665Z",
        "dateUpdated": "2026-09-25T14:23:59.996Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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