ManageEngine OpManager: Improper Neutralization of Special Elements Used in a Template Engine
CVE-2026-12370 is a high-severity improper neutralization of special elements used in a template engine vulnerability in ManageEngine OpManager from Zoho, with a CVSS 3.1 base score of 7.6 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 12.8.668 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 1.52% chance of exploitation within 30 days, higher than 75% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update ManageEngine OpManager to 12.8.668 or a later version.
- Update ManageEngine NetFlow Analyzer to 12.8.668 or a later version.
- Update ManageEngine Network Configuration Manager to 12.8.668 or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Zoho | ManageEngine OpManager | before 12.8.668 | 12.8.668 |
| Zoho | ManageEngine NetFlow Analyzer | before 12.8.668 | 12.8.668 |
| Zoho | ManageEngine Network Configuration Manager | before 12.8.668 | 12.8.668 |
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
- LowPerformance or availability is reduced.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L. Scored by CNA.
Official description
ZohoCorp ManageEngine OpManager, NetFlow Analyzer, and Network Configuration Manager versions 12.8.667 and below were vulnerable to a Server-Side Template Injection vulnerability in Configlet processing, which could lead to Remote Code Execution.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Neutralization of Special Elements Used in a Template Engine
The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine.
How developers prevent this class of flaw
- Choose a template engine that offers a sandbox or restricted mode, or at least limits the power of any available expressions, function calls, or commands.
- Use the template engine's sandbox or restricted mode, if available.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
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 Improper Neutralization of Special Elements Used in a Template Engine vulnerabilities
- 8.0 High severity
- 8.8 High severity
- 8.8 High severity
- 9.9 Critical severity
- 10.0 Critical severity
- 7.1 High severity
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