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CVE-2020-25827

OATHAuth extension in MediaWiki is not implementing rate limit

7.5 HighFix available

An issue was discovered in the OATHAuth extension in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. For Wikis using OATHAuth on a farm/cluster (such as via CentralAuth), rate limiting of OATH tokens is only done on a single site level. Thus, multiple requests can be made across many wikis/sites concurrently.

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
None
Integrity
High
Availability
None

Exploit likelihood

1.70%Up 0.7 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

An issue was discovered in the OATHAuth extension in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. For Wikis using OATHAuth on a farm/cluster (such as via CentralAuth), rate limiting of OATH tokens is only done on a single site level. Thus, multiple requests can be made across many wikis/sites concurrently.

Record
CVE-2020-25827
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:P/A:N
Weakness
CWE-307
Updated
2026-11-02
CVE List No score

An issue was discovered in the OATHAuth extension in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. For Wikis using OATHAuth on a farm/cluster (such as via CentralAuth), rate limiting of OATH tokens is only done on a single site level. Thus, multiple requests can be made across many wikis/sites concurrently.

Record
CVE-2020-25827
Updated
2026-11-02
EUVDEUVD-2022-5220 No score

An issue was discovered in the OATHAuth extension in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. For Wikis using OATHAuth on a farm/cluster (such as via CentralAuth), rate limiting of OATH tokens is only done on a single site level. Thus, multiple requests can be made across many wikis/sites concurrently.

Record
EUVD-2022-5220
Updated
2026-11-03
GitHub AdvisoriesGHSA-rqvj-fc2x-99q6 7.5

OATHAuth extension in MediaWiki is not implementing rate limit

An issue was discovered in the OATHAuth extension in MediaWiki before 1.31.9 and 1.32.x through 1.34.x before 1.34.3. For Wikis using OATHAuth on a farm/cluster (such as via CentralAuth), rate limiting of OATH tokens is only done on a single site level. Thus, multiple requests can be made across many wikis/sites concurrently.

Record
GHSA-rqvj-fc2x-99q6
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness
CWE-307
Updated
2026-11-02
OSV 7.5

An issue was discovered in the OATHAuth extension in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. For Wikis using OATHAuth on a farm/cluster (such as via CentralAuth), rate limiting of OATH tokens is only done on a single site level. Thus, multiple requests can be made across many wikis/sites concurrently.

Record
CVE-2020-25827
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2020-25827 7.5

An issue was discovered in the OATHAuth extension in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. For Wikis using OATHAuth on a farm/cluster (such as via CentralAuth), rate limiting of OATH tokens is only done on a single site level. Thus, multiple requests can be made across many wikis/sites concurrently.

Record
DEBIAN-CVE-2020-25827
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated
2026-11-02
Show 4 moreShow less
OSVGHSA-rqvj-fc2x-99q6 7.5

OATHAuth extension in MediaWiki is not implementing rate limit

An issue was discovered in the OATHAuth extension in MediaWiki before 1.31.9 and 1.32.x through 1.34.x before 1.34.3. For Wikis using OATHAuth on a farm/cluster (such as via CentralAuth), rate limiting of OATH tokens is only done on a single site level. Thus, multiple requests can be made across many wikis/sites concurrently.

Record
GHSA-rqvj-fc2x-99q6
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness
CWE-307
Updated
2026-11-02
OSVUBUNTU-CVE-2020-25827 7.5

An issue was discovered in the OATHAuth extension in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. For Wikis using OATHAuth on a farm/cluster (such as via CentralAuth), rate limiting of OATH tokens is only done on a single site level. Thus, multiple requests can be made across many wikis/sites concurrently.

Record
UBUNTU-CVE-2020-25827
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVBIT-mediawiki-2020-25827 No score

An issue was discovered in the OATHAuth extension in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. For Wikis using OATHAuth on a farm/cluster (such as via CentralAuth), rate limiting of OATH tokens is only done on a single site level. Thus, multiple requests can be made across many wikis/sites concurrently.

Record
BIT-mediawiki-2020-25827
Updated
2026-11-02
OSVMGASA-2020-0381 No score

Updated mediawiki packages fix security vulnerability

Multiple security issues were discovered in MediaWiki: SpecialUserRights could leak whether a user existed or not, multiple code paths lacked HTML sanitisation allowing for cross-site scripting and TOTP validation applied insufficient rate limiting against brute force attempts (CVE-2020-25812, CVE-2020-25813, CVE-2020-25814, CVE-2020-25815, CVE-2020-25827, CVE-2020-25828).

Possible issues with actors not being loaded from the correct database or wiki (CVE-2020-25869).

Record
MGASA-2020-0381
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mediawiki/core
Packagist
 1.31.0 up to 1.31.9
1.31.9
mediawiki/core
Packagist
 1.32.0 up to 1.34.3
1.34.3
mediawiki
Bitnami
 before 1.31.10, 1.32.0 up to 1.34.4
1.31.101.34.4
mediawiki
Debian:12
 before 1:1.35.0-1
1:1.35.0-1
mediawiki
Debian:13
 before 1:1.35.0-1
1:1.35.0-1
mediawiki
Debian:14
 before 1:1.35.0-1
1:1.35.0-1
mediawiki
Debian:9
From an advisory covering 4 CVEs
 before 1:1.27.7-1~deb9u4, 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 6 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~deb9u21:1.27.7-1~deb9u3
1:1.27.7-1~deb9u4
mediawiki
Debian:10
From an advisory covering 8 CVEs
 before 1:1.31.10-1~deb10u1, plus listed versions
1:1.31.2-11:1.31.4-11:1.31.4-1~deb10u11:1.31.5-11:1.31.5-2
Show 6 moreShow less
1:1.31.5-31:1.31.6-11:1.31.6-1~deb10u11:1.31.7-11:1.31.7-1~deb10u11:1.31.8-1
1:1.31.10-1~deb10u1
mediawiki/core
Packagist
 1.31.0 up to 1.31.9, plus listed versions
1.31.11.31.21.31.31.31.41.31.51.31.61.31.71.31.8
1.31.9
mediawiki/core
Packagist
 1.32.0 up to 1.34.3, plus listed versions
1.32.11.32.21.32.31.32.41.32.5
Show 12 moreShow less
1.32.61.33.01.33.0-rc.01.33.11.33.21.33.31.33.41.34.01.34.0-rc.01.34.0-rc.11.34.11.34.2
1.34.3
mediawiki
Mageia:7
From an advisory covering 7 CVEs
 before 1.31.10-1.mga7
1.31.10-1.mga7
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-2020-25827 is a high vulnerability (CVSS 7.5) in Mediawiki, published September 25, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.70%, the 77th percentile. Fixed in mediawiki/core 1.31.9.

References

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