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CVE-2021-44858

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37...

7.5 HighFix available

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. It is possible to use action=edit&undo= followed by action=mcrundo and action=mcrrestore to view private pages on a private wiki that has at least one page set in $wgWhitelistRead.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

1.37%Up 0.7 points since Dec 20, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. It is possible to use action=edit&undo= followed by action=mcrundo and action=mcrrestore to view private pages on a private wiki that has at least one page set in $wgWhitelistRead.

Record
CVE-2021-44858
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:P/I:N/A:N
Weakness
CWE-276
Updated
2026-11-02
CVE List No score

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. It is possible to use action=edit&undo= followed by action=mcrundo and action=mcrrestore to view private pages on a private wiki that has at least one page set in $wgWhitelistRead.

Record
CVE-2021-44858
Updated
2026-11-02
EUVDEUVD-2021-31661 No score

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. It is possible to use action=edit&undo= followed by action=mcrundo and action=mcrrestore to view private pages on a private wiki that has at least one page set in $wgWhitelistRead.

Record
EUVD-2021-31661
Updated
2026-11-03
GitHub AdvisoriesGHSA-7h7h-4rmp-2qm5 7.5

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37...

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. It is possible to use action=edit&undo= followed by action=mcrundo and action=mcrrestore to view private pages on a private wiki that has at least one page set in $wgWhitelistRead.

Record
GHSA-7h7h-4rmp-2qm5
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-276
Updated
2026-11-02
OSV 7.5

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. It is possible to use action=edit&undo= followed by action=mcrundo and action=mcrrestore to view private pages on a private wiki that has at least one page set in $wgWhitelistRead.

Record
CVE-2021-44858
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2021-44858 7.5

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. It is possible to use action=edit&undo= followed by action=mcrundo and action=mcrrestore to view private pages on a private wiki that has at least one page set in $wgWhitelistRead.

Record
DEBIAN-CVE-2021-44858
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2021-44858 7.5

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. It is possible to use action=edit&undo= followed by action=mcrundo and action=mcrrestore to view private pages on a private wiki that has at least one page set in $wgWhitelistRead.

Record
UBUNTU-CVE-2021-44858
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVBIT-mediawiki-2021-44858 No score

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. It is possible to use action=edit&undo= followed by action=mcrundo and action=mcrrestore to view private pages on a private wiki that has at least one page set in $wgWhitelistRead.

Record
BIT-mediawiki-2021-44858
Updated
2026-11-02
OSVMGASA-2021-0568 No score

Updated mediawiki packages fix security vulnerabilities

Updated mediawiki packages fix security vulnerabilities:

== Security fixes ==

  • (T292763. CVE-2021-44854) REST API incorrectly publicly caches autocomplete search results from private wikis.
  • (T271037, CVE-2021-44856) Title blocked in AbuseFilter can be created via Special:ChangeContentModel.
  • (T297322, CVE-2021-44857) Unauthorized users can use action=mcrundo to replace the content of arbitrary pages.
  • (T297322, CVE-2021-44858) Unauthorized users can view contents of private wikis using various actions.
  • (T297574, CVE-2021-45038) Unauthorized users can access private wiki contents using rollback action

=== Extension security fixes ===

  • (T293589, CVE-2021-44855) Blind Stored XSS in VisualEditor media dialog.
  • (T294686) Special:Nuke doesn't actually delete pages.
Record
MGASA-2021-0568
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mediawiki
Bitnami
 before 1.35.5, 1.36.0 up to 1.36.3, 1.37.0 up to 1.37.1
1.35.51.36.31.37.1
mediawiki
Debian:12
 before 1:1.35.5-1
1:1.35.5-1
mediawiki
Debian:13
 before 1:1.35.5-1
1:1.35.5-1
mediawiki
Debian:14
 before 1:1.35.5-1
1:1.35.5-1
mediawiki
Debian:9
 before 1:1.27.7-1+deb9u11, plus listed versions
1:1.27.3-11:1.27.4-11:1.27.4-1~bpo8+11:1.27.4-1~deb9u11:1.27.4-2
Show 13 moreShow less
1:1.27.4-31:1.27.5-1~deb9u11:1.27.6-1~deb9u11:1.27.7-1~deb9u11:1.27.7-1~deb9u101:1.27.7-1~deb9u21:1.27.7-1~deb9u31:1.27.7-1~deb9u41:1.27.7-1~deb9u51:1.27.7-1~deb9u61:1.27.7-1~deb9u71:1.27.7-1~deb9u81:1.27.7-1~deb9u9
1:1.27.7-1+deb9u11
mediawiki
Debian:11
From an advisory covering 3 CVEs
 before 1:1.35.4-1+deb11u2, plus listed versions
1:1.35.2-11:1.35.3-11:1.35.4-11:1.35.4-1~deb11u1
1:1.35.4-1+deb11u2
mediawiki
Mageia:8
From an advisory covering 6 CVEs
 before 1.35.5-1.mga8
1.35.5-1.mga8
mediawiki
Ubuntu:18.04:LTS
 All versions, plus listed versions
1:1.27.3-11:1.27.4-11:1.27.4-21:1.27.4-3
 None known
mediawiki
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
1:1.31.2-1ubuntu11:1.31.5-11:1.31.5-1ubuntu11:1.31.5-21:1.31.5-3
Show 4 moreShow less
1:1.31.5-3ubuntu11:1.31.6-11:1.31.7-11:1.31.7-1ubuntu0.1~esm1
 None known

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-44858 is a high vulnerability (CVSS 7.5) in Mediawiki, published December 15, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.37%, the 72nd percentile. Fixed in mediawiki 1.35.5.

References

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