CVE-2021-26634: SQL injection and file upload attacks are possible due to insufficient validation of input values in some para

Q: How do I fix CVE-2021-26634?

maxboard: upgrade to 1.9.6. Exact commands for each OS are on this page.

Q: Is CVE-2021-26634 being exploited?

CVE-2021-26634 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-26634 affect?

CVE-2021-26634 affects maxboard. Severity is critical (CVSS 9.8). 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

Q: How urgent is CVE-2021-26634?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-26634 is a critical-severity flaw (CVSS 9.8) affecting maxboard. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-89, CWE-288, CWE-434
Published	2022-06-02
Last modified	2026-06-17

Publisher (CNA): KrCERT/CC · Vendor: maxb

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-06-02 14:15 UTCPublished CVE record published
2026-06-17 03:43 UTCUpdated Record last modified

maxb maxboard UPGRADE

Affected: < 1.9.6

Fixed in: 1.9.6

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy maxboard || rpm -q maxboard || maxboard --version

2. UPGRADE to 1.9.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade maxboard

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade maxboard

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-26634?

maxboard: upgrade to 1.9.6. Exact commands for each OS are on this page.

Is CVE-2021-26634 being exploited?

CVE-2021-26634 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-26634 affect?

CVE-2021-26634 affects maxboard. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2021-26634?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-26636 HIGH 8.8 UPGRADE Stored XSS and SQL injection vulnerability in MaxBoard could lead to occur Remote Code Execution, which could
CVE-2021-26633 HIGH 7.5 UPGRADE SQL injection and Local File Inclusion (LFI) vulnerabilities in MaxBoard can cause information leakage and pri
CVE-2021-26628 HIGH 8.1 UPGRADE Insufficient script validation of the admin page enables XSS, which causes unauthorized users to steal admin p

References

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