{"schemaVersion":3,"id":"CVE-2021-35197","aliases":["MGASA-2021-0346","UBUNTU-CVE-2021-35197","DEBIAN-CVE-2021-35197"],"status":"published","duplicateOf":null,"title":null,"description":"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).","dates":{"published":"2021-07-02T12:28:45.000Z","modified":"2024-08-04T00:33:51.175Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5,"severity":"medium","vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01943,"percentile":0.79868,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.01943},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01943,"percentile":0.79868}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01943,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01943,"percentile":0.79868}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"REF_D52951F650A48ADE","name":"Exploit Reference (phabricator.wikimedia.org)","source":"reference","url":"https://phabricator.wikimedia.org/T280226","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-863","name":"Incorrect Authorization","description":"The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.","type":"weakness","status":"Incomplete","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/863.html"}],"affected":[{"vendor":"debian","product":"mediawiki","name":"mediawiki","label":"mediawiki","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/mediawiki","purlType":"deb","versions":[{"text":"< 1:1.35.3-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:1.35.3-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"mediawiki","name":"mediawiki","label":"mediawiki","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mediawiki","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"debian","product":"debian_linux","name":"debian linux","label":"debian_linux","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"9.0","noFixRecorded":false,"fixedIn":null},{"text":"10.0","noFixRecorded":false,"fixedIn":null},{"text":"11.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"9.0 | 10.0 | 11.0","eol":{"isEol":true,"eolDate":"2022-07-01T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"9","label":"9 (Stretch)","eolFrom":"2022-07-01T00:00:00.000Z","isLts":false,"isMaintained":true,"latestVersion":"9.13"},"product":{"name":"debian","label":"Debian","category":"os"}},"hubHref":"/vendor/debian/debian_linux"},{"vendor":"fedoraproject","product":"fedora","name":"fedora","label":"fedora","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"33","noFixRecorded":false,"fixedIn":null},{"text":"34","noFixRecorded":false,"fixedIn":null},{"text":"35","noFixRecorded":false,"fixedIn":null}],"versionsText":"33 | 34 | 35","eol":{"isEol":true,"eolDate":"2021-11-30T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"33","label":"33","eolFrom":"2021-11-30T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":null},"product":{"name":"fedora","label":"Fedora Linux","category":"os"}},"hubHref":"/vendor/fedoraproject/fedora"},{"vendor":"mageia","product":"mediawiki","name":"mediawiki","label":"mediawiki","ecosystem":"Mageia","cpePart":null,"purl":"pkg:rpm/mageia/mediawiki","purlType":"rpm","versions":[{"text":"< 1.31.15-1.mga7","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.31.15-1.mga7","eol":null,"hubHref":null},{"vendor":"mageia","product":"mediawiki","name":"mediawiki","label":"mediawiki","ecosystem":"Mageia","cpePart":null,"purl":"pkg:rpm/mageia/mediawiki","purlType":"rpm","versions":[{"text":"< 1.35.3-1.1.mga8","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.35.3-1.1.mga8","eol":null,"hubHref":null},{"vendor":"mediawiki","product":"mediawiki","name":"mediawiki","label":"mediawiki","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 1.31.15","noFixRecorded":false,"fixedIn":null},{"text":"≥ 1.32.0, < 1.35.3","noFixRecorded":false,"fixedIn":null},{"text":"≥ 1.36.0, < 1.36.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.31.15 | ≥ 1.32.0, < 1.35.3 | ≥ 1.36.0, < 1.36.1","eol":{"isEol":null,"eolDate":null,"matchMethod":"cpe","cycle":null,"product":{"name":"mediawiki","label":"MediaWiki","category":"server-app"}},"hubHref":"/vendor/mediawiki/mediawiki"}],"affectedCount":7,"eol":{"hasEol":true,"count":2},"references":[{"url":"https://phabricator.wikimedia.org/T280226","label":"phabricator.wikimedia.org/T280226","hostname":"phabricator.wikimedia.org","tags":["X Refsource MISC","REPORT","Exploit","Vendor Advisory"]},{"url":"https://lists.wikimedia.org/hyperkitty/list/mediawiki-announce%40lists.wikimedia.org/thread/YR3X4L2CPSEJVSY543AWEO65TD6APXHP/","label":"lists.wikimedia.org/hyperkitty/…","hostname":"lists.wikimedia.org","tags":["X Refsource CONFIRM"]},{"url":"https://security.gentoo.org/glsa/202107-40","label":"security.gentoo.org/glsa/202107-40","hostname":"security.gentoo.org","tags":["Vendor Advisory","X Refsource GENTOO","Third Party Advisory"]},{"url":"https://www.debian.org/security/2021/dsa-4979","label":"www.debian.org/security/2021/dsa-4979","hostname":"www.debian.org","tags":["Vendor Advisory","X Refsource DEBIAN","Third Party Advisory"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/10/msg00003.html","label":"lists.debian.org/debian-lts-announce/2021/10/msg00003.html","hostname":"lists.debian.org","tags":["Mailing List","X Refsource MLIST","Third Party Advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QNEAI2T3Y65I55ZB6UE6RMC662RZTGRX/","label":"lists.fedoraproject.org/archives/…","hostname":"lists.fedoraproject.org","tags":["Vendor Advisory","X Refsource FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CJDYJQWT43GBD6GNQ4OW7JOZ6WQ6DZTN/","label":"lists.fedoraproject.org/archives/…","hostname":"lists.fedoraproject.org","tags":["Vendor Advisory","X Refsource FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MDBPECBWN6LWNSWIQMVXK6PP4YFEUYHA/","label":"lists.fedoraproject.org/archives/…","hostname":"lists.fedoraproject.org","tags":["Vendor Advisory","X Refsource FEDORA"]},{"url":"https://advisories.mageia.org/MGASA-2021-0346.html","label":"advisories.mageia.org/MGASA-2021-0346.html","hostname":"advisories.mageia.org","tags":["Advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=29190","label":"bugs.mageia.org/show_bug.cgi?id=29190","hostname":"bugs.mageia.org","tags":["REPORT"]},{"url":"https://www.mediawiki.org/wiki/Release_notes/1.35#MediaWiki_1.35.3","label":"www.mediawiki.org/wiki/Release_notes/1.35","hostname":"www.mediawiki.org","tags":["WEB"]},{"url":"https://www.mediawiki.org/wiki/MediaWiki_1.31","label":"www.mediawiki.org/wiki/MediaWiki_1.31","hostname":"www.mediawiki.org","tags":["WEB"]},{"url":"https://ubuntu.com/security/CVE-2021-35197","label":"ubuntu.com/security/CVE-2021-35197","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://lists.wikimedia.org/hyperkitty/list/wikitech-l@lists.wikimedia.org/thread/YR3X4L2CPSEJVSY543AWEO65TD6APXHP/","label":"lists.wikimedia.org/hyperkitty/…","hostname":"lists.wikimedia.org","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-35197","label":"www.cve.org/CVERecord?id=CVE-2021-35197","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-35197","label":"security-tracker.debian.org/tracker/CVE-2021-35197","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["DLA-2779-1","DSA-4979-1"],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2021-07-02T12:28:45.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-04T00:33:51.175Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":40,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T06:55:22.672Z","stale":false,"partial":false}}