Maxboard multiple vulnerabilities

published 2022-06-01 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13428

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.4%; EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits: 0; none known

SQL injection and file upload attacks are possible due to insufficient validation of input values in some parameters and variables of files compromising Maxboard, which may lead to arbitrary code execution or privilege escalation. Attackers can use these vulnerabilities to perform attacks such as stealing server management rights using a web shell.

Patch / fix

fixed in 1

maxb maxboard 1.9.6

Exploit prediction

1.37% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

Max Yi Maxboard

Classification

Weakness

CWE-89 Improper Neutralization of Special Elements used in an SQL Command
CWE-288 Authentication Bypass Using an Alternate Path or Channel
CWE-434 Unrestricted Upload of File with Dangerous Type

References

krcert.or.kr /krcert/secNoticeView.do?bulletin_writing_sequence=66746
broken-link, third-party-advisory

Sources

CVE List CVE-2021-26634
NVD CVE-2021-26634

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary