TI-2026-57836 Aliases CVE-2026-84114 GHSA-q66c-gqf3-vf5c

Cleo Harmony SAML Authentication LocalUserUtil.getNativeUserByAssertions improper authentication

LOW 24CWE-287Published 2026-09-01 · Updated 2026-09-01

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: Low · Low · Low
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-287.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00458 39th percentileScored 2026-11-07

Fix Fixed Harmony (Cleo): 5.8.1.11

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Cleo	Harmony	5.8.1.0; 5.8.1.1; 5.8.1.2; 5.8.1.3; 5.8.1.4; 5.8.1.5; 5.8.1.6; 5.8.1.7; 5.8.1.8; 5.8.1.9; 5.8.1.10	5.8.1.11	Patch available	CNA

Harmony VendorCleo Affected 5.8.1.0; 5.8.1.1; 5.8.1.2; 5.8.1.3; 5.8.1.4; 5.8.1.5; 5.8.1.6; 5.8.1.7; 5.8.1.8; 5.8.1.9; 5.8.1.10 Fixed in 5.8.1.11 Patch available CNA

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:cleo:harmony::::::::	—	—	Cleo

cpe:2.3:a:cleo:harmony:*:*:*:*:*:*:*:* Versions — — ·Cleo

Remediation

Fix · CNA Harmony (Cleo) Fixed in 5.8.1.11

Timeline

2026-10-02 Threatist record created from CVE-2026-84114
2026-10-03 Alias added: GHSA-q66c-gqf3-vf5c

References

Patch 1

https://support.cleo.com/hc/en-us/articles/30258468834583-Cleo-Harmony-5-8-1-Release-Notes#Version58111

TI-2024-36997 In Cleo Harmony before 5.8.0.24, VLTrader before 5.8.0.24, and LexiCom before 5.8.0.24… KEVCVSS 3.1CRITICAL 9.8
TI-2024-34043 In Cleo Harmony before 5.8.0.21, VLTrader before 5.8.0.21, and LexiCom before 5.8.0.21… KEVCVSS 3.1CRITICAL 9.8
TI-2026-57837 Cleo Harmony JWT Refresh Token connections privileges management CVSS 4.0MEDIUM 6.9
TI-2022-20946 Exponential ReDoS in cleo leads to denial of service CVSS 3.1HIGH 7.5
TI-2021-12963 An issue was discovered in Cleo LexiCom 5.5.0.0. CVSS 3.1CRITICAL 9.8
TI-2021-12964 An issue was discovered in Cleo LexiCom 5.5.0.0. CVSS 3.1MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences