CVE-2021-21313Public exploitNetwork attack vector

Cross-site scripting via unsanitized tab parameters

Published Mar 3, 2021 · Updated Aug 3, 2024

Cross-site scripting in GLPI before 9.5.4 allows remote attackers to execute script in a user's browser through crafted tab parameters. The /ajax/common.tabs.php endpoint inserts unsanitized _target and id values into tab output, allowing a JavaScript URL or crafted function expression to execute. Exploitation requires a GLPI user to open the crafted tab response or click its generated control; script runs in the GLPI origin with that user's access.

CVSS severity4.9
Medium
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site scripting in GLPI before 9.5.4 allows remote attackers to execute script in a user's browser through crafted tab parameters. The /ajax/common.tabs.php endpoint inserts unsanitized _target and id values into tab output, allowing a JavaScript URL or crafted function expression to execute. Exploitation requires a GLPI user to open the crafted tab response or click its generated control; script runs in the GLPI origin with that user's access.

The record

CVE
CVE-2021-21313
Published
Mar 3, 2021
Updated
Aug 3, 2024
Vendor
GLPI Project
Product
GLPI
Classifications
CWE-74, CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 privilegesunauthenticated

What is affected?

GLPI Project · GLPIversion=< 9.5.4

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.9GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/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-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo