How severe is CVE-2021-26266?

CVE-2021-26266 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 none, integrity high, and availability none.

Is CVE-2021-26266 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26266?

CVE-2021-26266 affects Cpanel. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-26266?

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-2021-26266 published?

CVE-2021-26266 was published on 2021-01-26 and last updated on 2026-06-17.

CVE-2021-26266

CVE-2021-26266 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.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Cpanel
Published: 2021-01-26
Last modified: 2026-06-17

Description

cPanel before 92.0.9 allows a Reseller to bypass the suspension lock (SEC-578).

Frequently asked questions

What is CVE-2021-26266?: cPanel before 92.0.9 allows a Reseller to bypass the suspension lock (SEC-578).
How severe is CVE-2021-26266?: CVE-2021-26266 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 none, integrity high, and availability none.
Is CVE-2021-26266 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26266?: CVE-2021-26266 affects Cpanel. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-26266?: 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-2021-26266 published?: CVE-2021-26266 was published on 2021-01-26 and last updated on 2026-06-17.

References

https://docs.cpanel.net/changelogs/92-change-log/

Affected products (1)

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

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