Vulnerability · CVE-2025-0520

showdoc showdoc Unrestricted Upload of File with Dangerous Type

Published Apr 29, 2025 · corrected/updated Oct 8, 2026 · ShowDoc ShowDoc · evidence confidence very high

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.

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2025-0520 is a critical public vulnerability record for ShowDoc ShowDoc. CISA lists it as known exploited. Published remediation guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether ShowDoc ShowDoc is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: ShowDoc ShowDoc 0 <2.8.7 (0 <2.8.7); showdoc showdoc. Published remediation guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: CVSS 9.4, EPSS 265.0%. CISA lists it as known exploited. Sources contributing to this record: epss, euvd, vulncheck_kev. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

Exploitation evidence
Confirmed in CISA KEV since Apr 10, 2026. Listed in CISA KEV and VulnCheck KEV.
Patch and remediation
Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Code

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

Timeline

Detection, updates, and resolution for this record.

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.
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.
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.

Affected

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

Sources

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