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CVE-2020-26212— Any GLPI CalDAV calendars is read-only for every authenticated user

Quick assessment

Affected
glpi-project glpi
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GLPI是个人开发者的一款开源IT和资产管理软件。该软件提供功能全面的IT资源管理接口，你可以用它来建立数据库全面管理IT的电脑，显示器，服务器，打印机，网络设备，电话，甚至硒鼓和墨盒等。 GLPI 9.5.3之前版本存在权限许可和访问控制问题漏洞，该漏洞允许任何经过身份验证的用户都对其他所有用户(甚至是管理用户)的规划具有只读权限。

CVSS 7.7 · High EPSS 1.17% · P67
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I. Basic Information for CVE-2020-26212

Vulnerability Information
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Vulnerability Title
Any GLPI CalDAV calendars is read-only for every authenticated user
Source: CVE Program / CVE List V5
Vulnerability Description
GLPI stands for Gestionnaire Libre de Parc Informatique and it is a Free Asset and IT Management Software package, that provides ITIL Service Desk features, licenses tracking and software auditing. In GLPI before version 9.5.3, any authenticated user has read-only permissions to the planning of every other user, even admin ones. Steps to reproduce the behavior: 1. Create a new planning with 'eduardo.mozart' user (from 'IT' group that belongs to 'Super-admin') into it's personal planning at 'Assistance' > 'Planning'. 2. Copy the CalDAV url and use a CalDAV client (e.g. Thunderbird) to sync the planning with the provided URL. 3. Inform the username and password from any valid user (e.g. 'camila' from 'Proativa' group). 4. 'Camila' has read-only access to 'eduardo.mozart' personal planning. The same behavior happens to any group. E.g. 'Camila' has access to 'IT' group planning, even if she doesn't belong to this group and has a 'Self-service' profile permission). This issue is fixed in version 9.5.3. As a workaround, one can remove the `caldav.php` file to block access to CalDAV server.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
GLPI 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GLPI是个人开发者的一款开源IT和资产管理软件。该软件提供功能全面的IT资源管理接口，你可以用它来建立数据库全面管理IT的电脑，显示器，服务器，打印机，网络设备，电话，甚至硒鼓和墨盒等。 GLPI 9.5.3之前版本存在权限许可和访问控制问题漏洞，该漏洞允许任何经过身份验证的用户都对其他所有用户(甚至是管理用户)的规划具有只读权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
glpi-project glpi < 9.5.3 -

II. Public POCs for CVE-2020-26212

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8173 chars
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III. Intelligence Information for CVE-2020-26212

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Patches & Fixes for CVE-2020-26212 (1)

Vendor Advisories for CVE-2020-26212 (1)

Other References for CVE-2020-26212 (1)

IV. Related Vulnerabilities

Same product: glpi
Same vendor: glpi-project
Same weakness: CWE-862

V. Comments for CVE-2020-26212

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