CVE-2026-52100Public exploitNetwork attack vector

Unauthorized file overwrite via unchecked PUT uploads

Published Jul 14, 2026 · Updated Jul 14, 2026

CSRF in uploadPutHandler in andreimarcu linx-server 1.0 through 2.3.8 allows remote attackers to overwrite hosted files via PUT requests. The handler processes upload headers and writes content without applying the strictReferrerCheck used by the POST handler. Cross-origin browser exploitation normally fails under default CORS behavior, but direct clients or permissive proxies can upload, modify, or overwrite hosted content when upload authentication is not configured.

CVSS severity7.5
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in uploadPutHandler in andreimarcu linx-server 1.0 through 2.3.8 allows remote attackers to overwrite hosted files via PUT requests. The handler processes upload headers and writes content without applying the strictReferrerCheck used by the POST handler. Cross-origin browser exploitation normally fails under default CORS behavior, but direct clients or permissive proxies can upload, modify, or overwrite hosted content when upload authentication is not configured.

The record

CVE
CVE-2026-52100
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-352, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A: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.

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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-352Cross-Site Request Forgery (CSRF)
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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