CVE-2023-26775Public exploitNetwork attack vector

Unauthenticated code execution via image upload

Published Apr 4, 2023 · Updated Aug 2, 2024

Unrestricted file upload in Monitorr 1.7.6 allows remote attackers to execute arbitrary code through assets/php/upload.php. The endpoint accepts a user-supplied filename, checks only whether the temporary content parses as an image, then moves it under the web root. An unauthenticated request can therefore store a PHP-named image polyglot that the web server later interprets as code.

CVSS severity7.8
High
EPSS probability49.37%
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 Monitorr 1.7.6 allows remote attackers to execute arbitrary code through assets/php/upload.php. The endpoint accepts a user-supplied filename, checks only whether the temporary content parses as an image, then moves it under the web root. An unauthenticated request can therefore store a PHP-named image polyglot that the web server later interprets as code.

The record

CVE
CVE-2023-26775
Published
Apr 4, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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.

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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-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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