CVE-2021-39211: Disclosure of GLPI and server information in telemetry endpoint

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-09-15 · updated 2026-06-17
Weakness: CWE-200

Description

GLPI is a free Asset and IT management software package. Starting in version 9.2 and prior to version 9.5.6, the telemetry endpoint discloses GLPI and server information. This issue is fixed in version 9.5.6. As a workaround, remove the file `ajax/telemetry.php`, which is not needed for usual functions of GLPI.

Affected products

glpi-project glpi: from 9.2 before 9.5.6 — fixed in 9.5.6

How to fix

Upgrade to a fixed version: glpi-project glpi 9.5.6. Check the vendor advisory for mitigations.

References

https://github.com/glpi-project/glpi/releases/tag/9.5.6
https://github.com/glpi-project/glpi/security/advisories/GHSA-xx66-v3g5-w825
https://github.com/glpi-project/glpi/releases/tag/9.5.6
https://github.com/glpi-project/glpi/security/advisories/GHSA-xx66-v3g5-w825

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