Medium
mediawiki — security advisory
An issue was discovered in MediaWiki before 1.35.1. Missing users (accounts that don't exist) and hidden users (accounts that have been explicitly hidden due to being abusive, or similar) that the viewer cannot see are handled differently, exposing sensitive information about the hidden status to unprivileged viewers. This exists on various code paths.
- Products
- mediawiki
- Affected versions
- 1:1.27.3-1, 1:1.27.4-1, 1:1.27.4-2, 1:1.27.4-3, 1:1.31.2-1ubuntu1, 1:1.31.5-1, 1:1.31.5-1ubuntu1, 1:1.31.5-2, 1:1.31.5-3, 1:1.31.5-3ubuntu1, 1:1.31.6-1, 1:1.31.7-1, 1:1.31.7-1ubuntu0.1~esm1, 1:1.35.3-1, 1:1.35.4-1, 1:1.35.5-1, 1:1.35.5-1ubuntu1, 1:1.35.5-1ubuntu2, 1:1.35.5-1ubuntu3, 1:1.35.6-1, 1:1.35.6-1ubuntu0.1~esm1, 1:1.39.4-2, 1:1.39.5-1, 1:1.39.6-1, 1:1.39.7-1, 1:1.39.7-1ubuntu0.1~esm1, 1:1.43.1+dfsg-1, 1:1.43.1+dfsg-2, 1:1.43.3+dfsg-1, 1:1.43.5+dfsg-1, 1:1.43.6+dfsg-2, 1:1.43.8+dfsg-1, 1:1.43.8+dfsg-2, 1:1.43.9+dfsg-1, 1:1.43.9+dfsg-1ubuntu1
- Fixed versions
- Not specified
- CVEs
- CVE-2020-35480
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:29 UTC · Revision 1
Source evidence
An issue was discovered in MediaWiki before 1.35.1. Missing users (accounts that don't exist) and hidden users (accounts that have been explicitly hidden due to being abusive, or similar) that the viewer cannot see are handled differently, exposing sensitive information about the hidden status to unprivileged viewers. This exists on various code paths.
osv:UBUNTU-CVE-2020-35480
mediawiki
Fixed versions: Not specified
mediawiki
Fixed versions: Not specified
mediawiki
Fixed versions: Not specified
mediawiki
Fixed versions: Not specified
mediawiki
Fixed versions: Not specified
mediawiki
Fixed versions: Not specified
mediawiki
Fixed versions: Not specified
Complete source record
{
"id": "103eadd41c8d0556bff1c6337b8fba52f2294ef337dce915b172b26734a047a3",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-35480",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2020-35480",
"summary": "An issue was discovered in MediaWiki before 1.35.1. Missing users (accounts that don't exist) and hidden users (accounts that have been explicitly hidden due to being abusive, or similar) that the viewer cannot see are handled differently, exposing sensitive information about the hidden status to unprivileged viewers. This exists on various code paths.",
"evidence": "osv:UBUNTU-CVE-2020-35480",
"products": [
{
"name": {
"value": "mediawiki",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.27.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.27.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.27.4-2",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.27.4-3",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "mediawiki",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.31.2-1ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.31.5-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.31.5-1ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.31.5-2",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.31.5-3",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.31.5-3ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.31.6-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.31.7-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.31.7-1ubuntu0.1~esm1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "mediawiki",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.35.3-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.35.4-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.35.5-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.35.5-1ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.35.5-1ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.35.5-1ubuntu3",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.35.6-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.35.6-1ubuntu0.1~esm1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "mediawiki",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.39.4-2",
"evidence": "/affected/3/versions"
},
{
"value": "1:1.39.5-1",
"evidence": "/affected/3/versions"
},
{
"value": "1:1.39.6-1",
"evidence": "/affected/3/versions"
},
{
"value": "1:1.39.7-1",
"evidence": "/affected/3/versions"
},
{
"value": "1:1.39.7-1ubuntu0.1~esm1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "mediawiki",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.43.1+dfsg-1",
"evidence": "/affected/4/versions"
},
{
"value": "1:1.43.1+dfsg-2",
"evidence": "/affected/4/versions"
},
{
"value": "1:1.43.3+dfsg-1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "mediawiki",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.43.8+dfsg-2",
"evidence": "/affected/5/versions"
},
{
"value": "1:1.43.9+dfsg-1",
"evidence": "/affected/5/versions"
},
{
"value": "1:1.43.9+dfsg-1ubuntu1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "mediawiki",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.43.3+dfsg-1",
"evidence": "/affected/6/versions"
},
{
"value": "1:1.43.5+dfsg-1",
"evidence": "/affected/6/versions"
},
{
"value": "1:1.43.6+dfsg-2",
"evidence": "/affected/6/versions"
},
{
"value": "1:1.43.8+dfsg-1",
"evidence": "/affected/6/versions"
},
{
"value": "1:1.43.8+dfsg-2",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2020-35480",
"aliases": [
"UBUNTU-CVE-2020-35480"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "mediawiki",
"purl": "pkg:deb/ubuntu/mediawiki?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"1:1.27.3-1",
"1:1.27.4-1",
"1:1.27.4-2",
"1:1.27.4-3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-35480.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "mediawiki",
"binary_version": "1:1.27.4-3"
},
{
"binary_name": "mediawiki-classes",
"binary_version": "1:1.27.4-3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "mediawiki",
"purl": "pkg:deb/ubuntu/mediawiki?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"1:1.31.2-1ubuntu1",
"1:1.31.5-1",
"1:1.31.5-1ubuntu1",
"1:1.31.5-2",
"1:1.31.5-3",
"1:1.31.5-3ubuntu1",
"1:1.31.6-1",
"1:1.31.7-1",
"1:1.31.7-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-35480.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "mediawiki",
"binary_version": "1:1.31.7-1ubuntu0.1~esm1"
},
{
"binary_name": "mediawiki-classes",
"binary_version": "1:1.31.7-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "mediawiki",
"purl": "pkg:deb/ubuntu/mediawiki?arch=source&distro=esm-apps%2Fjammy",
"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
"1:1.35.3-1",
"1:1.35.4-1",
"1:1.35.5-1",
"1:1.35.5-1ubuntu1",
"1:1.35.5-1ubuntu2",
"1:1.35.5-1ubuntu3",
"1:1.35.6-1",
"1:1.35.6-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-35480.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "mediawiki",
"binary_version": "1:1.35.6-1ubuntu0.1~esm1"
},
{
"binary_name": "mediawiki-classes",
"binary_version": "1:1.35.6-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "mediawiki",
"purl": "pkg:deb/ubuntu/mediawiki?arch=source&distro=esm-apps%2Fnoble",
"ecosystem": "Ubuntu:Pro:24.04:LTS"
},
"versions": [
"1:1.39.4-2",
"1:1.39.5-1",
"1:1.39.6-1",
"1:1.39.7-1",
"1:1.39.7-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-35480.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "mediawiki",
"binary_version": "1:1.39.7-1ubuntu0.1~esm1"
},
{
"binary_name": "mediawiki-classes",
"binary_version": "1:1.39.7-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
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],
"package": {
"name": "mediawiki",
"purl": "pkg:deb/ubuntu/mediawiki?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"1:1.43.1+dfsg-1",
"1:1.43.1+dfsg-2",
"1:1.43.3+dfsg-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-35480.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "mediawiki",
"binary_version": "1:1.43.3+dfsg-1"
},
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"binary_name": "mediawiki-classes",
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]
}
},
{
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"events": [
{
"introduced": "0"
}
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}
],
"package": {
"name": "mediawiki",
"purl": "pkg:deb/ubuntu/mediawiki?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"1:1.43.8+dfsg-2",
"1:1.43.9+dfsg-1",
"1:1.43.9+dfsg-1ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-35480.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "mediawiki",
"binary_version": "1:1.43.9+dfsg-1ubuntu1"
},
{
"binary_name": "mediawiki-classes",
"binary_version": "1:1.43.9+dfsg-1ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "mediawiki",
"purl": "pkg:deb/ubuntu/mediawiki?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1:1.43.3+dfsg-1",
"1:1.43.5+dfsg-1",
"1:1.43.6+dfsg-2",
"1:1.43.8+dfsg-1",
"1:1.43.8+dfsg-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-35480.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "mediawiki",
"binary_version": "1:1.43.8+dfsg-2"
},
{
"binary_name": "mediawiki-classes",
"binary_version": "1:1.43.8+dfsg-2"
}
]
}
}
],
"modified": "2026-10-17T12:56:55.760337085Z",
"provider": "osv",
"upstream": [
"CVE-2020-35480"
],
"references": [
"https://ubuntu.com/security/CVE-2020-35480",
"https://phabricator.wikimedia.org/T120883",
"https://lists.wikimedia.org/pipermail/wikitech-l/2020-December/094126.html",
"https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html",
"https://www.cve.org/CVERecord?id=CVE-2020-35480"
]
},
"related_cves": [
{
"value": "CVE-2020-35480",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 356548,
"published_at": "2020-12-18T08:15:00+00:00"
}