CVE-2023-53980Public exploitNetwork attack vector

Remote code execution via semicolon extension bypass

Published Dec 22, 2025 · Updated Dec 22, 2025

Unrestricted file upload in ProjectSend r1605 allows attackers to execute arbitrary commands through upload.process.php. The endpoint accepts a semicolon-delimited filename such as openme.sh;jpg, validates the apparent final extension, and retains attacker-supplied shell content. The published workflow uses a valid PHP session and CSRF token to rename the stored file to a shell script, with execution triggered when another user opens it.

CVSS severity8.7
High
EPSS probability0.92%
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 ProjectSend r1605 allows attackers to execute arbitrary commands through upload.process.php. The endpoint accepts a semicolon-delimited filename such as openme.sh;jpg, validates the apparent final extension, and retains attacker-supplied shell content. The published workflow uses a valid PHP session and CSRF token to rename the stored file to a shell script, with execution triggered when another user opens it.

The record

CVE
CVE-2023-53980
Published
Dec 22, 2025
Updated
Dec 22, 2025
Vendor
ProjectSend
Product
ProjectSend
Classifications
CWE-434, T1204.002, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 22, 2025Record 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=r1605

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ProjectSend · ProjectSendversion=r1605

Published CVSS scores

9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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
T1204.002Malicious File
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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