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Vulnerabilities

Vulnerability · CVE-2025-0520

showdoc showdoc Unrestricted Upload of File with Dangerous Type

Published Apr 29, 2025 · catalog updated Oct 8, 2026 · ShowDoc ShowDoc

Patch now

CVE-2025-0520 is in the CISA known-exploited catalog. Confirm ShowDoc ShowDoc against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Critical9.4
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
2.65%
Remediation
Remediation guidance
Affected products
vendor ShowDoc ShowDoc 0 <2.8.7 · vendor showdoc showdoc

An unrestricted file upload vulnerability in ShowDoc caused by improper validation of file extension allows execution of arbitrary PHP, leading to remote code execution.This issue affects ShowDoc: before 2.8.7. VulnCheck canary evidence.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor ShowDoc ShowDoc 0 <2.8.70 <2.8.7
  • vendor showdoc showdocversion unspecified

How to fix CVE-2025-0520

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-0520 is in the CISA known-exploited catalog. Confirm ShowDoc ShowDoc against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with ShowDoc ShowDoc 0 <2.8.7 0 <2.8.7. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 2.65%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 10, 2026 · VulnCheck KEV

    Detected

    An unrestricted file upload vulnerability in ShowDoc caused by improper validation of file extension allows execution of arbitrary PHP, leading to remote code execution.This issue affects ShowDoc: before 2.8.7. VulnCheck canary evidence.

  2. Apr 10, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  3. Oct 8, 2026 · EUVD

    Updated

    An unrestricted file upload vulnerability in ShowDoc caused by improper validation of file extension allows execution of arbitrary PHP, leading to remote code execution.This issue affects ShowDoc: before 2.8.7.

Sources

  • CVE.orgVulnerability recordCVE-2025-0520

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-0520

    30-day exploitation probability 2.6%

    first.org
  • EUVDVulnerability recordEUVD-2025-12661

    An unrestricted file upload vulnerability in ShowDoc caused by improper validation of file extension allows execution of arbitrary PHP, leading to remote code execution.This issue affects ShowDoc: before 2.8.7.

    euvd.enisa.europa.eu
  • VulnCheck KEVConfirmed exploitationCVE-2025-0520

    An unrestricted file upload vulnerability in ShowDoc caused by improper validation of file extension allows execution of arbitrary PHP, leading to remote code execution.This issue affects ShowDoc: before 2.8.7.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.