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CVE-2021-26634

30
FAUCET Score

CVE-2021-26634 describes critical SQL injection and file upload vulnerabilities within Maxboard, affecting both Linux and Maxboard products. These flaws stem from insufficient input validation, potentially enabling arbitrary code execution and privilege escalation. With a CVSS score of 9.8 (Critical), the vulnerability is easily exploitable over the network without user interaction, allowing attackers to gain full control, including server management rights via web shells. Despite its severity, there is currently no public exploit code available (Metasploit, Nuclei, ExploitDB), it is not listed in the KEV catalog, and it has garnered minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.9.6CPE matchmatch criteria
cpe:2.3:a:maxb:maxboard:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.25%
Probability of exploitation in next 30 days
EPSS Percentile
66.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0125 is in the 53rd percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

krcert.or.kr / krcert/secNoticeView.do
Broken LinkThird Party Advisory