CVE Explorer
CVE-2026-53909
MCO does not correctly validate types of uploaded files. File upload validation functionality relies only on client-side checks, which can be bypassed. An authorized, low-privileged attacker can upload files with arbitrary types to the server.
Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1 but may also affect other versions.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unknown","product":"MCO","vendor":"MyComplianceOffice","versions":[{"status":"affected","version":"25.3.3.1","versionType":"custom"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:3000f4a54c51708de4427334fbd746a5bf61ed2a820299c02d36b100be1660dd · sha256:3881f21a6c15641d… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.3,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"…
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:3000f4a54c51708de4427334fbd746a5bf61ed2a820299c02d36b100be1660dd · sha256:3881f21a6c15641d… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-434","description":"CWE-434 Unrestricted Upload of File with Dangerous Type","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:3000f4a54c51708de4427334fbd746a5bf61ed2a820299c02d36b100be1660dd · sha256:3881f21a6c15641d… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"tags":["third-party-advisory"],"url":"https://cert.pl/en/posts/2026/07/CVE-2026-53902"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3000f4a54c51708de4427334fbd746a5bf61ed2a820299c02d36b100be1660dd · sha256:3881f21a6c15641d… · /containers/cna/references/0
{"tags":["product"],"url":"https://mco.mycomplianceoffice.com/"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3000f4a54c51708de4427334fbd746a5bf61ed2a820299c02d36b100be1660dd · sha256:3881f21a6c15641d… · /containers/cna/references/1
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.