ManageEngine OpManager: Authorization Bypass Through User-Controlled Key
CVE-2026-84791 is a high-severity authorization bypass through user-controlled key vulnerability in ManageEngine OpManager from Zoho, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists version 12.8.711 as the first without the flaw, so updating ManageEngine OpManager to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.44% chance of exploitation within 30 days, higher than 74% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update ManageEngine OpManager to 12.8.711 or a later version.
- Update ManageEngine Firewall Analyzer to 12.8.711 or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Zoho | ManageEngine OpManager | before 12.8.711 | 12.8.711 |
| Zoho | ManageEngine Firewall Analyzer | before 12.8.711 | 12.8.711 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- LowLimited modification of data is possible.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N. Scored by CNA.
Official description
ZohoCorp ManageEngine OpManager and Firewall Analyzer versions 12.8.710 and below were vulnerable to a Broken Access Control vulnerability that allowed an authenticated low-privilege user to modify Change Management report schedule configurations for firewalls outside their assigned scope.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Authorization Bypass Through User-Controlled Key
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
How developers prevent this class of flaw
- For each and every data access, ensure that the user has sufficient privilege to access the record that is being requested.
- Make sure that the key that is used in the lookup of a specific user's record is not controllable externally by the user or that any tampering can be detected.
- Use encryption in order to make it more difficult to guess other legitimate values of the key or associate a digital signature with the key so that the server can verify that there has been no tampering.
More Authorization Bypass Through User-Controlled Key vulnerabilities (CWE-639)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
References
Other references
Other vulnerabilities in ManageEngine OpManager
- 7.4 High severity
- 7.7 High severity
- 8.8 High severity
- 8.8 High severity
- 9.9 Critical severity
- 7.1 High severity
Recent Authorization Bypass Through User-Controlled Key vulnerabilities
- 8.2 High severity
- 7.3 High severity
- 9.1 Critical severity
- 8.7 High severity
- 8.8 High severity
- 7.1 High severity
Spotted an error? Tell us.