CVE-2021-21313

low-risk

Published 2021-03-03

GLPI is open source software which stands for Gestionnaire Libre de Parc Informatique and it is a Free Asset and IT Management Software package. In GLPI before verison 9.5.4, there is a vulnerability in the /ajax/common.tabs.php endpoint, indeed, at least two parameters _target and id are not properly sanitized. Here are two payloads (due to two different exploitations depending on which parameter you act) to exploit the vulnerability:/ajax/common.tabs.php?_target=javascript:alert(document.cookie)&_itemtype=DisplayPreference&_glpi_tab=DisplayPreference$2&id=258&displaytype=Ticket (Payload triggered if you click on the button). /ajax/common.tabs.php?_target=/front/ticket.form.php&_itemtype=Ticket&_glpi_tab=Ticket$1&id=(){};(function%20(){alert(document.cookie);})();function%20a&#.

Do I need to act?

0.33% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 4.9/10 Medium

NETWORK / LOW complexity

Affected Products (1)

Glpi

Affected Vendors

Glpi-Project

References (4)

Release Notes https://github.com/glpi-project/glpi/releases/tag/9.5.4

Third Party Advisory https://github.com/glpi-project/glpi/security/advisories/GHSA-h4hj-mrpg-xfgx

Release Notes https://github.com/glpi-project/glpi/releases/tag/9.5.4

Third Party Advisory https://github.com/glpi-project/glpi/security/advisories/GHSA-h4hj-mrpg-xfgx

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low-risk

Severity 20/34 · Moderate

Exploitability 1/34 · Minimal

Exposure 5/34 · Minimal