CVE-2021-26634

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-06-03. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
65.4%
KEV
Not listed

Published

June 2, 2022

Last Modified

November 21, 2024

References (2)

Weakness Classification(4)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-15 16:55 UTCEPSS rescore
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  1. 2026-06-28 04:54 UTCEPSS rescore
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  9. 2026-06-23 21:31 UTCEPSS rescore
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  11. 2026-06-22 14:24 UTCEPSS rescore
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  48. 2026-05-31 22:29 UTCEPSS rescore
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  50. 2026-05-31 00:15 UTCEPSS rescore
  51. 2026-05-29 13:42 UTCEPSS rescore
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  57. 2026-05-26 07:17 UTCEPSS rescore
  58. 2026-05-26 07:17 UTCEPSS rescore
  59. 2026-05-25 21:21 UTCEG score recompute
  60. 2026-05-25 21:21 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2021-26634?
CVE-2021-26634 is a critical vulnerability published on June 2, 2022. 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…
When was CVE-2021-26634 disclosed?
CVE-2021-26634 was first published in the National Vulnerability Database on June 2, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-26634 actively exploited?
CVE-2021-26634 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 65.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-26634?
CVE-2021-26634 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-26634?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-26634, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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