CVE-2021-25955Network attack vector

Account takeover via numeric-entity sanitization bypass

Published Aug 15, 2021 · Updated Sep 16, 2024

Stored XSS in the WYSIWYG Editor module of Dolibarr ERP & CRM 2.8.1 through 13.0.2 allows remote authenticated users to hijack accounts. The checkVal sanitizer fails to normalize malformed or nested numeric HTML entities before filtering, allowing obfuscated script handlers to survive. Exploitation requires a low-privilege account able to update the targeted Private Note and an administrator to view it; session ID access enables account takeover.

CVSS severity9.0
Critical
EPSS probability0.89%
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 the WYSIWYG Editor module of Dolibarr ERP & CRM 2.8.1 through 13.0.2 allows remote authenticated users to hijack accounts. The checkVal sanitizer fails to normalize malformed or nested numeric HTML entities before filtering, allowing obfuscated script handlers to survive. Exploitation requires a low-privilege account able to update the targeted Private Note and an administrator to view it; session ID access enables account takeover.

The record

CVE
CVE-2021-25955
Published
Aug 15, 2021
Updated
Sep 16, 2024
Vendor
Dolibarr Foundation
Product
Dolibarr ERP & CRM
Classifications
CWE-79, T1539
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=unspecified <=v13.0.2
  2. Affected versionversion=v2.8.1 <unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Dolibarr Foundation · Dolibarr ERP & CRMversion=unspecified <=v13.0.2; version=v2.8.1 <unspecified

Published CVSS scores

9.0GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1539Steal Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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