CVE-2024-5853Network attack vector

Authenticated arbitrary file upload via missing type validation

Published Jun 19, 2024 · Updated Apr 8, 2026

Arbitrary file upload in Image Optimizer, Resizer and CDN – Sirv 7.2.6 and earlier allows remote authenticated users to write server files. The sirv_upload_file_by_chanks AJAX action processes chunked input without checking the uploaded file type before storing it. Contributor-level access is sufficient; code execution additionally requires the server to execute an uploaded file.

CVSS severity9.9
Critical
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in Image Optimizer, Resizer and CDN – Sirv 7.2.6 and earlier allows remote authenticated users to write server files. The sirv_upload_file_by_chanks AJAX action processes chunked input without checking the uploaded file type before storing it. Contributor-level access is sufficient; code execution additionally requires the server to execute an uploaded file.

The record

CVE
CVE-2024-5853
Published
Jun 19, 2024
Updated
Apr 8, 2026
Vendor
Sirv Limited
Product
Image Optimizer, Resizer and CDN – Sirv
Classifications
CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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 <=7.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Sirv Limited · Image Optimizer, Resizer and CDN – Sirvversion=0 <=7.2.6

Published CVSS scores

9.9WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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