CVE-2021-45806Public exploitNetwork attack vector

Authenticated code execution via unsafe template evaluation

Published Jan 13, 2022 · Updated Jul 9, 2026

Code injection in JPress 4.2.0 allows remote authenticated users to execute arbitrary code by editing an article template. The template editor accepts Velocity directives that enable Fastjson auto-type, instantiate ScriptEngineManager, and evaluate attacker-supplied JavaScript. Access to the admin template editor is required; rendering the altered article executes commands with the JPress process's privileges.

CVSS severity8.8
High
EPSS probability1.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in JPress 4.2.0 allows remote authenticated users to execute arbitrary code by editing an article template. The template editor accepts Velocity directives that enable Fastjson auto-type, instantiate ScriptEngineManager, and evaluate attacker-supplied JavaScript. Access to the admin template editor is required; rendering the altered article executes commands with the JPress process's privileges.

The record

CVE
CVE-2021-45806
Published
Jan 13, 2022
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-94, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 13, 2022CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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