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Vulnerability record · CVE-2018-20718 · published 15 January 2019

CVE-2018-20718: Pydio deserialization of untrusted data vulnerability

Pydio · Pydio

In Pydio before 8.2.2, an attack is possible via PHP Object Injection because a user is allowed to use the $phpserial$a:0:{} syntax to store a preference. An attacker either needs a "public link" of a file, or access to any unprivileged user account for creation of such a link.

9.8 CVSS 3.0 Critical EPSS 3.7% · top 10.6% CWE-502 · Deserialization of untrusted data
9.8CVSS 3.0 base score, v2 10.0
3.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

In Pydio before 8.2.2, an attack is possible via PHP Object Injection because a user is allowed to use the $phpserial$a:0:{} syntax to store a preference. An attacker either needs a "public link" of a file, or access to any unprivileged user account for creation of such a link.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://blog.ripstech.com/2018/pydio-unauthenticated-remote-code-execution/ ExploitThird Party Advisory
https://blog.ripstech.com/2018/pydio-unauthenticated-remote-code-execution/ ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2013-4267Pydio os command injection vulnerabilityAjaxeplorer before 5.0.1 allows remote attackers to execute arbitrary commands via shell metacharacters in the (1) archive_name parameter to the Powe…EPSS 4.1%9.8CVE-2019-9642Pydio path traversal vulnerabilityAn issue was discovered in proxy.php in pydio-core in Pydio through 8.2.2. Through an unauthenticated request, it possible to evaluate malicious PHP …EPSS 2.4%9.8CVE-2015-3431Pydio os command injection vulnerabilityPydio (formerly AjaXplorer) before 6.0.7 allows remote attackers to execute arbitrary commands via unspecified vectors, aka "Pydio OS Command Injecti…EPSS 4.1%8.8CVE-2019-20452Pydio deserialization of untrusted data vulnerabilityA problem was found in Pydio Core before 8.2.4 and Pydio Enterprise before 8.2.4. A PHP object injection is present in the page plugins/core.access/s…EPSS 2.1%8.8CVE-2019-20453Pydio deserialization of untrusted data vulnerabilityA problem was found in Pydio Core before 8.2.4 and Pydio Enterprise before 8.2.4. A PHP object injection is present in the page plugins/uploader.http…EPSS 2.1%7.7CVE-2019-15033Pydio server-side request forgery (ssrf) vulnerabilityPydio 6.0.8 allows Authenticated SSRF during a Remote Link Feature download. An attacker can specify an intranet address in the file parameter to ind…EPSS 1.3%7.5CVE-2013-6227Ajaxplorer vulnerabilityUnrestricted file upload vulnerability in plugins/editor.zoho/agent/save_zoho.php in the Zoho plugin in Pydio (formerly AjaXplorer) before 5.0.4 allo…EPSS 8.0%7.3CVE-2019-10049Pydio cross-site scripting vulnerabilityIt is possible for an attacker with regular user access to the web application of Pydio through 8.2.2 to trick an administrator user into opening a l…EPSS 1.1%

Source: NIST National Vulnerability Database (record CVE-2018-20718), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.