CVE-2026-84114: Improper Authentication in Cleo Harmony
Description
A vulnerability has been found in Cleo Harmony up to 5.8.1.10. Impacted is the function LocalUserUtil.getNativeUserByAssertions of the component SAML Authentication. Such manipulation of the argument Email leads to improper authentication. The attack can be executed remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 5.8.1.11 is recommended to address this issue. Upgrading the affected component is recommended.
CVSS v4.0
Score 5.3medium
Affected software
Cleo
Harmony
cpe:2.3:a:cleo:harmony:*:*:*:*:*:*:*:*AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability affects the SAML Authentication component of Cleo Harmony, specifically the LocalUserUtil.getNativeUserByAssertions function. Improper handling of the Email argument allows an attacker to bypass authentication controls remotely. The issue is present in all versions up to and including 5.8.1.10. The vulnerability has a CVSS 4.0 base score of 5.3, indicating medium severity. Although exploit code has been publicly disclosed, there are no known exploits in the wild at this time. The vendor recommends upgrading to version 5.8.1.11 to remediate the issue.
Potential Impact
Successful exploitation allows an attacker to bypass authentication mechanisms remotely by manipulating the Email argument in the affected function. This could lead to unauthorized access to the system or sensitive data. The impact is limited to improper authentication without direct evidence of privilege escalation or data corruption.
Mitigation Recommendations
Upgrading to Cleo Harmony version 5.8.1.11 is recommended to address this vulnerability. No official patch or temporary fix details are provided beyond this upgrade recommendation. Patch status is confirmed by the vendor's recommendation to upgrade. No additional mitigation steps are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-09-01T07:20:36.866Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a96e6ebacd9273b49d7163c
Added to database: 09/01/2026, 14:53:31 UTC
Last enriched: 09/07/2026, 14:27:44 UTC
Last updated: 10/16/2026, 06:48:19 UTC
Views: 97
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