High
Security advisory
In MediaWiki before 1.31.15, 1.32.x through 1.35.x before 1.35.3, and 1.36.x before 1.36.1, bots have certain unintended API access. When a bot account has a "sitewide block" applied, it is able to still "purge" pages through the MediaWiki Action API (which a "sitewide block" should have prevented).
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-35197
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 05:42 UTC · Revision 1
Source evidence
In MediaWiki before 1.31.15, 1.32.x through 1.35.x before 1.35.3, and 1.36.x before 1.36.1, bots have certain unintended API access. When a bot account has a "sitewide block" applied, it is able to still "purge" pages through the MediaWiki Action API (which a "sitewide block" should have prevented).
osv:CVE-2021-35197
Complete source record
{
"id": "5a803d4c60a561a7f85a547a2926fe27578e174f05b229af4f4d593c5b3cb877",
"url": "https://osv.dev/vulnerability/CVE-2021-35197",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-35197",
"summary": "In MediaWiki before 1.31.15, 1.32.x through 1.35.x before 1.35.3, and 1.36.x before 1.36.1, bots have certain unintended API access. When a bot account has a \"sitewide block\" applied, it is able to still \"purge\" pages through the MediaWiki Action API (which a \"sitewide block\" should have prevented).",
"evidence": "osv:CVE-2021-35197",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-35197",
"aliases": [
"BIT-mediawiki-2021-35197",
"CVE-2021-35197"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/wikimedia/mediawiki",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "db844fb107e8a74e0c8a7455012a20f977fa790d"
},
{
"introduced": "0fbb878ef366477535a709b0c2564bdcf4b176d1"
},
{
"fixed": "923676858a9521c96b7051641010d920796bb408"
},
{
"introduced": "bc542ec6d8573dfb906b468901799e0017875f1e"
},
{
"fixed": "b6cf6b337262ed84b76e96ed0f7ccbb702a46e9c"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.31.15"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.32.0"
},
{
"fixed": "1.35.3"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.36.0"
},
{
"fixed": "1.36.1"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"1.36.0",
"1.31.14",
"1.35.2",
"1.31.13",
"1.31.12",
"1.35.1",
"1.31.11",
"1.31.8",
"1.35.0",
"1.31.10",
"1.31.9",
"1.35.0-rc.3",
"1.35.0-rc.2",
"1.35.0-rc.1",
"1.35.0-rc.0",
"1.31.7",
"1.31.6",
"1.31.5",
"1.31.4",
"1.31.3",
"1.31.2",
"1.31.1",
"1.31.0",
"1.31.0-rc.2",
"1.31.0-rc.1",
"1.31.0-rc.0",
"test-hashar-for-ci",
"1.6.0",
"1.5.0beta4",
"1.5.0beta3",
"1.5.0beta2",
"1.5.0beta1",
"1.5.0alpha2",
"1.5.0alpha1",
"1.3.0beta1",
"1.1.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-35197.json"
}
}
],
"modified": "2026-10-24T10:30:32.710032051Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CJDYJQWT43GBD6GNQ4OW7JOZ6WQ6DZTN/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MDBPECBWN6LWNSWIQMVXK6PP4YFEUYHA/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QNEAI2T3Y65I55ZB6UE6RMC662RZTGRX/",
"https://lists.wikimedia.org/hyperkitty/list/mediawiki-announce%40lists.wikimedia.org/thread/YR3X4L2CPSEJVSY543AWEO65TD6APXHP/",
"https://lists.debian.org/debian-lts-announce/2021/10/msg00003.html",
"https://security.gentoo.org/glsa/202107-40",
"https://www.debian.org/security/2021/dsa-4979",
"https://phabricator.wikimedia.org/T280226"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
},
{
"introduced": "10.0"
},
{
"last_affected": "10.0"
},
{
"introduced": "11.0"
},
{
"last_affected": "11.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "33"
},
{
"last_affected": "33"
},
{
"introduced": "34"
},
{
"last_affected": "34"
},
{
"introduced": "35"
},
{
"last_affected": "35"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-35197",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 433092,
"published_at": "2021-07-02T13:15:07.727+00:00"
}