CVE-2021-29459Public exploitNetwork attack vector

Account takeover via unescaped stored text fields

Published Apr 20, 2021 · Updated Aug 3, 2024

Stored XSS in affected XWiki Platform releases before 12.8 allows remote attackers to hijack user sessions through saved text fields. The Old Core object display path renders saved simple-text properties such as Company without escaping HTML metacharacters, so stored script elements execute when a profile is viewed. Anonymous users can populate simple-text fields, while registered users can use profile fields or, with edit rights, App Within Minutes lists; execution requires a victim to view the value and can enable account takeover.

CVSS severity6.1
Medium
EPSS probability1.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in affected XWiki Platform releases before 12.8 allows remote attackers to hijack user sessions through saved text fields. The Old Core object display path renders saved simple-text properties such as Company without escaping HTML metacharacters, so stored script elements execute when a profile is viewed. Anonymous users can populate simple-text fields, while registered users can use profile fields or, with edit rights, App Within Minutes lists; execution requires a victim to view the value and can enable account takeover.

The record

CVE
CVE-2021-29459
Published
Apr 20, 2021
Updated
Aug 3, 2024
Vendor
CryptPad
Product
XWiki Platform
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 20, 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=< 12.6.3
  2. Affected versionversion=>= 12.6.4, < 12.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CryptPad · XWiki Platformversion=< 12.6.3; version=>= 12.6.4, < 12.8

Published CVSS scores

9.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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