CVE-2021-39213: IP restriction on GLPI API Bypass with custom header injection

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-09-15 · updated 2026-06-17
Weakness: CWE-74

Description

GLPI is a free Asset and IT management software package. Starting in version 9.1 and prior to version 9.5.6, GLPI with API Rest enabled is vulnerable to API bypass with custom header injection. This issue is fixed in version 9.5.6. One may disable API Rest as a workaround.

Affected products

glpi-project glpi: from 9.1 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-6w9f-2m6g-5777
https://github.com/glpi-project/glpi/releases/tag/9.5.6
https://github.com/glpi-project/glpi/security/advisories/GHSA-6w9f-2m6g-5777

Get alerted when CVE-2021-39213 or the next vulnerability affects your stack