High severity · published Jun 28, 2022
CVE-2022-34750
An issue was discovered in MediaWiki through 1.38.1
7.5
CVSS
1.3%
EPSS
No
On KEV
Description
An issue was discovered in MediaWiki through 1.38.1. The lemma length of a Wikibase lexeme is currently capped at a thousand characters. Unfortunately, this length is not validated, allowing much larger lexemes to be created, which introduces various denial-of-service attack vectors within the Wikibase and WikibaseLexeme extensions. This is related to Special:NewLexeme and Special:NewProperty.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.3% · higher than 71% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ME
Mediawiki · Mediawiki
through 1.38.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-34750
CVE.org
https://www.cve.org/CVERecord?id=CVE-2022-34750
Vendor Advisory
https://gerrit.wikimedia.org/r/q/I8171bfef73e525d73efa60b407ce147130ea4742
Vendor Advisory
https://gerrit.wikimedia.org/r/q/Id89a9b08e40f075d2d422cafd03668dff3ce7fc9
Mailing List
https://phabricator.wikimedia.org/T308659
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