CVE-2018-20718

Severity: critical (CVSS 9.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-01-15 · updated 2026-06-17
Weakness: CWE-502

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.

Affected products

Pydio: before 8.2.2 — fixed in 8.2.2

How to fix

Upgrade to a fixed version: Pydio 8.2.2. Check the vendor advisory for mitigations.

References

https://blog.ripstech.com/2018/pydio-unauthenticated-remote-code-execution/
https://blog.ripstech.com/2018/pydio-unauthenticated-remote-code-execution/

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