CVE-2021-41801Network attack vector

Queued job continues after permission loss

Published Oct 11, 2021 · Updated Aug 4, 2024

Incorrect access control in the ReplaceText extension in MediaWiki through 1.41 allows remote authenticated users to continue replacement jobs after losing permission via queued jobs. ReplaceText enqueues one job per page and the worker does not re-check the submitting user's permission before execution, so blocking the user does not stop pending edits. Exploitation requires a user authorized to submit a replacement and a subsequent permission loss while jobs remain queued; impact includes unauthorized content and title modifications and possible service disruption from continued edits.

CVSS severity8.8
High
EPSS probability1.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect access control in the ReplaceText extension in MediaWiki through 1.41 allows remote authenticated users to continue replacement jobs after losing permission via queued jobs. ReplaceText enqueues one job per page and the worker does not re-check the submitting user's permission before execution, so blocking the user does not stop pending edits. Exploitation requires a user authorized to submit a replacement and a subsequent permission loss while jobs remain queued; impact includes unauthorized content and title modifications and possible service disruption from continued edits.

The record

CVE
CVE-2021-41801
Published
Oct 11, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-862, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 11, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1068Exploitation for Privilege Escalation

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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