CVE-2021-21312Public exploitNetwork attack vector

Stored script execution via unsanitized Web Link

Published Mar 3, 2021 · Updated Aug 3, 2024

Stored XSS in GLPI before 9.5.4 allows remote authenticated users with document-upload rights to execute JavaScript through a Web Link. The document form at /front/document.form.php stores the Web Link value without sanitizing injected HTML attributes, then renders it as a clickable link. Execution requires a privileged user to save the document and a viewer to activate its link, allowing script execution in the viewer's GLPI session.

CVSS severity5.4
Medium
EPSS probability0.59%
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 GLPI before 9.5.4 allows remote authenticated users with document-upload rights to execute JavaScript through a Web Link. The document form at /front/document.form.php stores the Web Link value without sanitizing injected HTML attributes, then renders it as a clickable link. Execution requires a privileged user to save the document and a viewer to activate its link, allowing script execution in the viewer's GLPI session.

The record

CVE
CVE-2021-21312
Published
Mar 3, 2021
Updated
Aug 3, 2024
Vendor
GLPI Project
Product
GLPI
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 3, 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=< 9.5.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GLPI Project · GLPIversion=< 9.5.4

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:N/I:H/A:N
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

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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