CVE-2021-45038Public exploitNetwork attack vector

Private-page disclosure via rollback parameter transclusion

Published Dec 17, 2021 · Updated Aug 4, 2024

Information disclosure in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1 allows remote attackers to read private wiki pages. The rollback action expands a crafted from parameter as a template transclusion and returns the referenced page without enforcing its read permission. Unauthenticated exposure requires a private wiki with at least one page allowed by $wgWhitelistRead or $wgWhitelistReadRegexp; the flaw discloses page content without data loss.

CVSS severity5.3
Medium
EPSS probability1.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1 allows remote attackers to read private wiki pages. The rollback action expands a crafted from parameter as a template transclusion and returns the referenced page without enforcing its read permission. Unauthenticated exposure requires a private wiki with at least one page allowed by $wgWhitelistRead or $wgWhitelistReadRegexp; the flaw discloses page content without data loss.

The record

CVE
CVE-2021-45038
Published
Dec 17, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3BitnamiCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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