CVE-2021-21324Public exploitNetwork attack vector

Authenticated account enumeration via mismatched IDOR tokens

Published Mar 8, 2021 · Updated Aug 3, 2024

Authorization bypass in GLPI before 9.5.4 allows remote authenticated users to enumerate item names and user logins through solution search. The knowledge-base dropdown accepts a user-controlled item_itemtype and incremental item_items_id while its IDOR token fails to bind the requested object type. Any valid account with access to an open ticket's Solution form can substitute User and guess identifiers, exposing names and login identifiers without modifying data.

CVSS severity6.8
Medium
EPSS probability1.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in GLPI before 9.5.4 allows remote authenticated users to enumerate item names and user logins through solution search. The knowledge-base dropdown accepts a user-controlled item_itemtype and incremental item_items_id while its IDOR token fails to bind the requested object type. Any valid account with access to an open ticket's Solution form can substitute User and guess identifiers, exposing names and login identifiers without modifying data.

The record

CVE
CVE-2021-21324
Published
Mar 8, 2021
Updated
Aug 3, 2024
Vendor
GLPI Project
Product
GLPI
Classifications
CWE-639, T1087
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 8, 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

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
6.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:P/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1087Account Discovery

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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