Xiaomi Mi Browser up to 14.65.x ThirdDocViewerActivity CopyExternalFile.copyFromUri _display_name path traversal

Summaryinfo

A vulnerability classified as problematic has been found in Xiaomi Mi Browser up to 14.65.x. Affected by this issue is the function CopyExternalFile.copyFromUri of the component ThirdDocViewerActivity. The manipulation of the argument _display_name leads to path traversal. This vulnerability is uniquely identified as CVE-2026-127209. Local access is required to approach this attack. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Xiaomi Mi Browser up to 14.65.x. This issue affects the function CopyExternalFile.copyFromUri of the component ThirdDocViewerActivity. The manipulation of the argument _display_name with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Xiaomi Mi Browser Android Application (com.mi.globalbrowser) before 14.66.0-gn contains a path traversal vulnerability in the exported ThirdDocViewerActivity component, where CopyExternalFile.copyFromUri() copies content provider streams using an unsanitized filename from the _display_name column without basename reduction or canonical-path checks. A zero-permission co-resident malicious application can supply a crafted content provider with a _display_name containing .. sequences to make the browser write attacker-controlled bytes to an arbitrary path within its external storage directory, escaping the intended cache_docs staging location without requiring user interaction.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-127209 since 11/12/2026. The exploitation is known to be easy. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 14.66.0 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• Xiaomi

Name

• Mi Browser

Version

• 14.0
• 14.1
• 14.2
• 14.3
• 14.4
• 14.5
• 14.6
• 14.7
• 14.8
• 14.9
• 14.10
• 14.11
• 14.12
• 14.13
• 14.14
• 14.15
• 14.16
• 14.17
• 14.18
• 14.19
• 14.20
• 14.21
• 14.22
• 14.23
• 14.24
• 14.25
• 14.26
• 14.27
• 14.28
• 14.29
• 14.30
• 14.31
• 14.32
• 14.33
• 14.34
• 14.35
• 14.36
• 14.37
• 14.38
• 14.39
• 14.40
• 14.41
• 14.42
• 14.43
• 14.44
• 14.45
• 14.46
• 14.47
• 14.48
• 14.49
• 14.50
• 14.51
• 14.52
• 14.53
• 14.54
• 14.55
• 14.56
• 14.57
• 14.58
• 14.59
• 14.60
• 14.61
• 14.62
• 14.63
• 14.64
• 14.65

License

• open-source

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion