CVE-2021-47900Public exploitNetwork attack vector

Unauthenticated command execution via session-file overwrite

Published Jan 27, 2026 · Updated Jan 27, 2026

Remote code execution in Gila CMS before 2.0.0 allows remote attackers to execute system commands through crafted HTTP requests. The admin route uses a traversal value in the GSESSIONID cookie as a session path and writes a PHP-bearing User-Agent into index.php. No credentials or interaction are required; loading the modified index file runs shell_exec with web-server privileges.

CVSS severity9.3
Critical
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Gila CMS before 2.0.0 allows remote attackers to execute system commands through crafted HTTP requests. The admin route uses a traversal value in the GSESSIONID cookie as a session path and writes a PHP-bearing User-Agent into index.php. No credentials or interaction are required; loading the modified index file runs shell_exec with web-server privileges.

The record

CVE
CVE-2021-47900
Published
Jan 27, 2026
Updated
Jan 27, 2026
Vendor
Gila CMS
Product
Gila CMS
Classifications
CWE-98, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Gila CMS · Gila CMSversion=0 <2.0.0

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-98Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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