How severe is CVE-2020-4040?

CVE-2020-4040 has a CVSS 3.x base score of 8.6, 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-2020-4040 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-4040?

CVE-2020-4040 affects Boltcms Bolt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-4040?

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-2020-4040 published?

CVE-2020-4040 was published on 2020-06-08 and last updated on 2026-06-17.

CVE-2020-4040

CVE-2020-4040 is a high-severity vulnerability in Boltcms Bolt with a CVSS 3.x base score of 8.6. 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-352.

Key facts

Severity: High (CVSS 3.x base score 8.6)
CVSS v2: 4.3
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Boltcms Bolt
Published: 2020-06-08
Last modified: 2026-06-17

Description

Bolt CMS before version 3.7.1 lacked CSRF protection in the preview generating endpoint. Previews are intended to be generated by the admins, developers, chief-editors, and editors, who are authorized to create content in the application. But due to lack of proper CSRF protection, unauthorized users could generate a preview. This has been fixed in Bolt 3.7.1

Frequently asked questions

What is CVE-2020-4040?: Bolt CMS before version 3.7.1 lacked CSRF protection in the preview generating endpoint. Previews are intended to be generated by the admins, developers, chief-editors, and editors, who are authorized to create content in the application. But due to lack of proper CSRF protection, unauthorized users could generate a preview. This has been fixed in Bolt 3.7.1
How severe is CVE-2020-4040?: CVE-2020-4040 has a CVSS 3.x base score of 8.6, 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-2020-4040 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-4040?: CVE-2020-4040 affects Boltcms Bolt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-4040?: 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-2020-4040 published?: CVE-2020-4040 was published on 2020-06-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:boltcms:bolt:*:*:*:*:*:*:*:*

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