What is CVE-2018-20718?

CVE-2018-20718 is a critical-severity vulnerability in Pydio, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2019-01-15.

How severe is CVE-2018-20718?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2018-20718 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Deserialization in Pydio

CVE-2018-20718

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.

Vulnerability class: Insecure Deserialization

EPSS: 0.037 (88.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Pydio
N/a — versions n/a

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

Public proof-of-concept exploits

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2018-20718?: CVE-2018-20718 is a critical-severity vulnerability in Pydio, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2019-01-15.
How severe is CVE-2018-20718?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2018-20718 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.