UBUNTU-CVE-2026-55888

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Source
https://ubuntu.com/security/CVE-2026-55888
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55888.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-55888
Upstream
Published
2026-10-26T00:00:00Z
Modified
2026-10-27T04:17:56Z
Severity
  • 8.8 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

XDG Desktop Portal is a desktop integration portal. Prior to version 1.22.1, malicious sandboxed applications can use the FileChooser.SaveFiles method to gain arbitrary file access to non-existing files on the host (limited to files the user has access to). The FileChooser.SaveFiles method takes optional filenames which get appended to the selected directory by backends. The backends are supposed to check that the file does not exist yet. The filenames are not validated by the frontend and also not by common backends. This issue has been patched in version 1.22.1.

References

Affected packages

Ubuntu:16.04:LTS
xdg-desktop-portal

Package

Name
xdg-desktop-portal
Purl
pkg:deb/ubuntu/xdg-desktop-portal?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.0.3-0ubuntu0.0

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "xdg-desktop-portal",
            "binary_version":  "1.0.3-0ubuntu0.0"
        },
        {
            "binary_name":  "xdg-desktop-portal-tests",
            "binary_version":  "1.0.3-0ubuntu0.0"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55888.json"
Ubuntu:18.04:LTS
xdg-desktop-portal

Package

Name
xdg-desktop-portal
Purl
pkg:deb/ubuntu/xdg-desktop-portal?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.8-2
0.8-3
0.9-1
0.9-2
0.10-0ubuntu1
0.10-2
0.10-4
0.11-1
1.*
1.0.3-0ubuntu0.2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "xdg-desktop-portal",
            "binary_version":  "1.0.3-0ubuntu0.2"
        },
        {
            "binary_name":  "xdg-desktop-portal-tests",
            "binary_version":  "1.0.3-0ubuntu0.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55888.json"
Ubuntu:20.04:LTS
xdg-desktop-portal

Package

Name
xdg-desktop-portal
Purl
pkg:deb/ubuntu/xdg-desktop-portal?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.4.2-2
1.4.2-3
1.6.0-1
1.6.0-1ubuntu1
1.6.0-1ubuntu2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "xdg-desktop-portal",
            "binary_version":  "1.6.0-1ubuntu2"
        },
        {
            "binary_name":  "xdg-desktop-portal-tests",
            "binary_version":  "1.6.0-1ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55888.json"
Ubuntu:22.04:LTS
xdg-desktop-portal

Package

Name
xdg-desktop-portal
Purl
pkg:deb/ubuntu/xdg-desktop-portal?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.8.1-1build1
1.10.1-2
1.10.1-4
1.12.1-1
1.12.1-1build1
1.12.1-1ubuntu1
1.14.1-1
1.14.1-2
1.14.2-1
1.14.2-1ubuntu1
1.14.2-1ubuntu2
1.14.3-0ubuntu2
1.14.3-0ubuntu2.22.04.1
1.14.4-1ubuntu1~22.04.1
1.14.4-1ubuntu2~22.04.1
1.14.4-1ubuntu2~22.04.2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "xdg-desktop-portal",
            "binary_version":  "1.14.4-1ubuntu2~22.04.2"
        },
        {
            "binary_name":  "xdg-desktop-portal-tests",
            "binary_version":  "1.14.4-1ubuntu2~22.04.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55888.json"
Ubuntu:24.04:LTS
xdg-desktop-portal

Package

Name
xdg-desktop-portal
Purl
pkg:deb/ubuntu/xdg-desktop-portal?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.18.0-1ubuntu1
1.18.2-1ubuntu1
1.18.2-1ubuntu3
1.18.2-1ubuntu4
1.18.3-1ubuntu1
1.18.4-1ubuntu2
1.18.4-1ubuntu2.24.04.1
1.18.4-1ubuntu2.24.04.2
1.18.4-1ubuntu2.24.04.3

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "xdg-desktop-portal",
            "binary_version":  "1.18.4-1ubuntu2.24.04.3"
        },
        {
            "binary_name":  "xdg-desktop-portal-tests",
            "binary_version":  "1.18.4-1ubuntu2.24.04.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55888.json"
Ubuntu:26.04:LTS
xdg-desktop-portal

Package

Name
xdg-desktop-portal
Purl
pkg:deb/ubuntu/xdg-desktop-portal?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.20.3+ds-1ubuntu1
1.20.3+ds-1ubuntu2
1.21.0+ds-1ubuntu3
1.21.0+ds-1ubuntu4
1.21.0+ds-1ubuntu6
1.21.0+ds-1ubuntu7
1.21.0+ds-1ubuntu8
1.21.1+ds-1ubuntu1
1.21.1+ds-1ubuntu2
1.21.1+ds-1ubuntu3
1.21.1+ds-1ubuntu3.1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "xdg-desktop-portal",
            "binary_version":  "1.21.1+ds-1ubuntu3.1"
        },
        {
            "binary_name":  "xdg-desktop-portal-tests",
            "binary_version":  "1.21.1+ds-1ubuntu3.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55888.json"
Ubuntu:26.10
xdg-desktop-portal

Package

Name
xdg-desktop-portal
Purl
pkg:deb/ubuntu/xdg-desktop-portal?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.21.1+ds-1ubuntu3
1.21.1+ds-1ubuntu4
1.21.1+ds-1ubuntu5
1.21.1+ds-1ubuntu6

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "xdg-desktop-portal",
            "binary_version":  "1.21.1+ds-1ubuntu6"
        },
        {
            "binary_name":  "xdg-desktop-portal-tests",
            "binary_version":  "1.21.1+ds-1ubuntu6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55888.json"