CVE-2026-57827Public exploitNetwork attack vector

Unauthenticated code execution via unguarded upload task

Published Jul 11, 2026 · Updated Jul 11, 2026

Unrestricted file upload in RSJoomla! RSFiles! 1.17.11 and earlier allows remote attackers to execute arbitrary PHP code. The frontend write task can be invoked directly and saves a request-supplied file without repeating the preflight permission or extension checks. No account or user interaction is required, and the default downloads directory permits an uploaded PHP file to execute in the web server context.

CVSS severity9.8
Critical
EPSS probability2.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in RSJoomla! RSFiles! 1.17.11 and earlier allows remote attackers to execute arbitrary PHP code. The frontend write task can be invoked directly and saves a request-supplied file without repeating the preflight permission or extension checks. No account or user interaction is required, and the default downloads directory permits an uploaded PHP file to execute in the web server context.

The record

CVE
CVE-2026-57827
Published
Jul 11, 2026
Updated
Jul 11, 2026
Vendor
RSJoomla!
Product
RSFiles!
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 11, 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=1.0-1.17.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

RSJoomla! · RSFiles!version=1.0-1.17.11

Published CVSS scores

10.0Joomla! ProjectCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A
9.8NIST NVDCVSS: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-434Unrestricted Upload of File with Dangerous Type
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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