CVE-2021-21379Network attack vector

Privileged script execution via macro-author context confusion

Published Mar 12, 2021 · Updated Aug 3, 2024

Improper authorization in XWiki Platform allows remote authenticated users to execute injected scripts with a macro author's rights. The wikimacrocontent macro evaluates caller-supplied content under the wiki macro author's permissions rather than preserving the caller's security context. Exploitation requires a custom or extension-provided macro that embeds wikimacrocontent and a caller who invokes attacker-controlled content; XWiki Standard includes no such macro by default.

CVSS severity5.4
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in XWiki Platform allows remote authenticated users to execute injected scripts with a macro author's rights. The wikimacrocontent macro evaluates caller-supplied content under the wiki macro author's permissions rather than preserving the caller's security context. Exploitation requires a custom or extension-provided macro that embeds wikimacrocontent and a caller who invokes attacker-controlled content; XWiki Standard includes no such macro by default.

The record

CVE
CVE-2021-21379
Published
Mar 12, 2021
Updated
Aug 3, 2024
Vendor
CryptPad
Product
XWiki Platform
Classifications
CWE-285, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 12, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 11.4.0, < 11.10.11
  2. Affected versionversion=>= 12.0.0, < 12.6.3
  3. Affected versionversion=>= 12.7.0, < 12.8-rc-1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

CryptPad · XWiki Platformversion=>= 11.4.0, < 11.10.11; version=>= 12.0.0, < 12.6.3; version=>= 12.7.0, < 12.8-rc-1

Published CVSS scores

5.4GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-285Improper Authorization
T1059Command and Scripting Interpreter

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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