CVE-2021-47819Public exploitNetwork attack vector

Guest-to-server command execution via profile file upload

Published Jan 15, 2026 · Updated Jan 15, 2026

Unrestricted file upload in ProjeQtOr 9.1.4 allows remote authenticated users with guest access to execute arbitrary server commands. The profile attachment handler at tool/saveAttachment.php accepts a mixed-case PHP payload and stores it beneath files/attach, where the web server interprets the uploaded script. A guest session is sufficient; requesting the attachment URL runs commands with the web server process's privileges.

CVSS severity9.8
Critical
EPSS probability0.43%
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 ProjeQtOr 9.1.4 allows remote authenticated users with guest access to execute arbitrary server commands. The profile attachment handler at tool/saveAttachment.php accepts a mixed-case PHP payload and stores it beneath files/attach, where the web server interprets the uploaded script. A guest session is sufficient; requesting the attachment URL runs commands with the web server process's privileges.

The record

CVE
CVE-2021-47819
Published
Jan 15, 2026
Updated
Jan 15, 2026
Vendor
ProjeQtOr
Product
ProjeQtOr
Classifications
CWE-434, T1505.003, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 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=9.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ProjeQtOr · ProjeQtOrversion=9.1.4

Published CVSS scores

9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Web Shell
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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