How severe is CVE-2018-20718?

CVE-2018-20718 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-20718 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20718?

CVE-2018-20718 affects Pydio. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-20718?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2018-20718 published?

CVE-2018-20718 was published on 2019-01-15 and last updated on 2026-06-17.

CVE-2018-20718

CVE-2018-20718 is a critical-severity vulnerability in Pydio with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Pydio
Published: 2019-01-15
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2018-20718?: CVE-2018-20718 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-20718 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20718?: CVE-2018-20718 affects Pydio. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-20718?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2018-20718 published?: CVE-2018-20718 was published on 2019-01-15 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:pydio:pydio:*:*:*:*:*:*:*:*

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