How severe is CVE-2020-26103?

CVE-2020-26103 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2020-26103 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-26103?

CVE-2020-26103 affects Cpanel. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-26103?

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

When was CVE-2020-26103 published?

CVE-2020-26103 was published on 2020-09-25 and last updated on 2026-06-17.

CVE-2020-26103

CVE-2020-26103 is a high-severity vulnerability in Cpanel with a CVSS 3.x base score of 7.5. 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-521.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-521
Affected product: Cpanel
Published: 2020-09-25
Last modified: 2026-06-17

Description

In cPanel before 88.0.3, an insecure site password is used for Mailman on a templated VM (SEC-551).

Frequently asked questions

What is CVE-2020-26103?: In cPanel before 88.0.3, an insecure site password is used for Mailman on a templated VM (SEC-551).
How severe is CVE-2020-26103?: CVE-2020-26103 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2020-26103 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-26103?: CVE-2020-26103 affects Cpanel. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-26103?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-26103 published?: CVE-2020-26103 was published on 2020-09-25 and last updated on 2026-06-17.

References

https://docs.cpanel.net/changelogs/88-change-log/

Affected products (1)

cpe:2.3:a:cpanel:cpanel:*:*:*:*:*:*:*:*

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Other CWE-521 (Weak Password Requirements) vulnerabilities

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CVE-2025-12552 — Critical (CVSS 9.8): Insufficient Password Policy.This issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5.
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Browse all CWE-521 (Weak Password Requirements) vulnerabilities →