CVE-2021-26636Network attack vector

Remote code execution via unneutralized variable

Published Jun 22, 2022 · Updated Aug 3, 2024

Stored XSS and SQL injection in MaxBoard 1.9.6.1 and earlier allow remote attackers to execute code after required user interaction. Input defenses cover other values but omit an undisclosed variable, allowing crafted data in that variable to reach page and database processing unneutralized. No authentication is required, but a user must interact with the stored payload; successful exploitation exposes information and escalates privileges.

CVSS severity8.8
High
EPSS probability1.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS and SQL injection in MaxBoard 1.9.6.1 and earlier allow remote attackers to execute code after required user interaction. Input defenses cover other values but omit an undisclosed variable, allowing crafted data in that variable to reach page and database processing unneutralized. No authentication is required, but a user must interact with the stored payload; successful exploitation exposes information and escalates privileges.

The record

CVE
CVE-2021-26636
Published
Jun 22, 2022
Updated
Aug 3, 2024
Vendor
Max Yi
Product
MaxBoard
Classifications
CWE-89, CWE-79, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=1.9.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Max Yi · MaxBoardversion=unspecified <=1.9.6.1

Published CVSS scores

8.8KrCERT/CCCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
9.6NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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