UBUNTU-CVE-2026-16434

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Source
https://ubuntu.com/security/CVE-2026-16434
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-16434.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-16434
Upstream
Published
2026-08-25T02:16:00Z
Modified
2026-09-02T19:35:29.835491990Z
Severity
  • 2.3 (Low) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Adminer 4.6.0 through 5.5.0 (fixed in 5.5.1) contains an incomplete fix for a prior X-Forwarded-Prefix vulnerability (GHSA-8478-xrj3-h9c2). The validation guard (bootstrap.inc.php) only rejects prefixes matching ^/[^/], blocking //evil.com but allowing values such as /\evil.com whose second character is a backslash. Because browsers normalize backslash to forward slash, a network-path reference survives into REQUESTURI and reaches cookiepath(), affecting the Set-Cookie Path attribute. Exploitation requires that clients can set the X-Forwarded-Prefix header (a misconfigured or absent reverse proxy). Impact is limited to anomalous cookie-path scoping.

References

Affected packages

Ubuntu:22.04:LTS
adminer

Package

Name
adminer
Purl
pkg:deb/ubuntu/adminer?arch=source&distro=jammy

Affected ranges

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

Affected versions

4.*
4.7.9-2
4.8.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.8.1-1",
            "binary_name": "adminer"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-16434.json"
Ubuntu:24.04:LTS
adminer

Package

Name
adminer
Purl
pkg:deb/ubuntu/adminer?arch=source&distro=noble

Affected ranges

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

Affected versions

4.*
4.8.1-1
4.8.1-1ubuntu1
4.8.1-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.8.1-2",
            "binary_name": "adminer"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-16434.json"
Ubuntu:26.04:LTS
adminer

Package

Name
adminer
Purl
pkg:deb/ubuntu/adminer?arch=source&distro=resolute

Affected ranges

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

Affected versions

5.*
5.2.1+dfsg-1
5.3.0+dfsg-1
5.4.0+dfsg-1
5.4.1+dfsg-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "5.4.1+dfsg-1",
            "binary_name": "adminer"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-16434.json"
Ubuntu:Pro:16.04:LTS
adminer

Package

Name
adminer
Purl
pkg:deb/ubuntu/adminer?arch=source&distro=esm-apps%2Fxenial

Affected ranges

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

Affected versions

4.*
4.2.1-1
4.2.1-1ubuntu1
4.2.1-1ubuntu1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.2.1-1ubuntu1+esm1",
            "binary_name": "adminer"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-16434.json"
Ubuntu:Pro:18.04:LTS
adminer

Package

Name
adminer
Purl
pkg:deb/ubuntu/adminer?arch=source&distro=esm-apps%2Fbionic

Affected ranges

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

Affected versions

4.*
4.3.1-2
4.5.0-1
4.6.1-1
4.6.2-1
4.6.2-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.6.2-1ubuntu0.1~esm1",
            "binary_name": "adminer"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-16434.json"
Ubuntu:Pro:20.04:LTS
adminer

Package

Name
adminer
Purl
pkg:deb/ubuntu/adminer?arch=source&distro=esm-apps%2Ffocal

Affected ranges

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

Affected versions

4.*
4.7.2-1
4.7.4-1
4.7.5-1
4.7.6-1
4.7.6-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.7.6-1ubuntu0.1~esm1",
            "binary_name": "adminer"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-16434.json"