CVE-2021-46147Network attack vector

Unauthorized mass page edits via missing CSRF token

Published Jan 7, 2022 · Updated Aug 4, 2024

CSRF 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 trigger mass page edits via MassEditRegex. The SpecialMassEditRegex form accepts a state-changing POST without validating an anti-CSRF token, allowing crafted content to submit attacker-chosen replacement parameters. A logged-in user must load the crafted content while holding the masseditregex permission, which is assigned to no group by default; exploitation can rewrite multiple wiki pages under that user's authority.

CVSS severity8.8
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF 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 trigger mass page edits via MassEditRegex. The SpecialMassEditRegex form accepts a state-changing POST without validating an anti-CSRF token, allowing crafted content to submit attacker-chosen replacement parameters. A logged-in user must load the crafted content while holding the masseditregex permission, which is assigned to no group by default; exploitation can rewrite multiple wiki pages under that user's authority.

The record

CVE
CVE-2021-46147
Published
Jan 7, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-352, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 7, 2022CVE 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

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1204.001Malicious Link

Public exploit references

No public exploit references are available in this record.

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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