CVE-2021-47900

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-01-27. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
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.

Gila CMS versions prior to 2.0.0 contain a remote code execution vulnerability that allows unauthenticated attackers to execute arbitrary system commands through manipulated HTTP headers. Attackers can inject PHP code in the User-Agent header with shell_exec() to run system commands by sending crafted requests to the admin endpoint.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
44.8%
KEV
Not listed

Published

January 27, 2026

Last Modified

April 15, 2026

Advisory Details (3)

Auto-updated May 1, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Gila CMS < 2.0.0 - Remote Code Execution | Advisories | VulnCheck

https://www.vulncheck.com/advisories/gila-cms-remote-code-execution
generic

GitHub - GilaCMS/gila: A lightweight and fast CMS system built with PHP · GitHub

https://github.com/GilaCMS/gila
generic

Gila CMS | Gila CMS

https://gilacms.com/

Weakness Classification(1)

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.

Showing the most recent 100 of 133 total refreshes for this CVE.

  1. 2026-07-15 16:55 UTCEPSS rescore
  2. 2026-07-15 01:58 UTCEPSS rescore
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  4. 2026-07-13 22:27 UTCEPSS rescore
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  1. 2026-06-28 14:05 UTCEPSS rescore
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  10. 2026-06-23 21:31 UTCEPSS rescore
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  26. 2026-06-13 22:58 UTCEPSS rescore
  27. 2026-06-13 22:58 UTCEPSS rescore
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  35. 2026-06-08 06:39 UTCEG score recompute
  36. 2026-06-08 06:39 UTCGHSA enrichment
  37. 2026-06-08 02:32 UTCEG score recompute
  38. 2026-06-08 02:32 UTCGHSA enrichment
  39. 2026-06-07 15:23 UTCEPSS rescore
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  41. 2026-06-06 13:46 UTCEPSS rescore
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  49. 2026-06-02 20:11 UTCEPSS rescore
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  53. 2026-05-31 22:29 UTCEPSS rescore
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  74. 2026-05-20 22:37 UTCEPSS rescore
  75. 2026-05-20 22:37 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2021-47900?
CVE-2021-47900 is a critical vulnerability published on January 27, 2026. Gila CMS versions prior to 2.0.0 contain a remote code execution vulnerability that allows unauthenticated attackers to execute arbitrary system commands through manipulated HTTP headers. Attackers can inject PHP code in the User-Agent header with shell_exec() to run system commands by sending…
When was CVE-2021-47900 disclosed?
CVE-2021-47900 was first published in the National Vulnerability Database on January 27, 2026, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47900 actively exploited?
CVE-2021-47900 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 44.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-47900?
CVE-2021-47900 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-47900?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47900, 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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