How severe is CVE-2020-5840?

CVE-2020-5840 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-2020-5840 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5840?

CVE-2020-5840 affects Hashbrowncms Hashbrown Cms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-5840?

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-2020-5840 published?

CVE-2020-5840 was published on 2020-01-06 and last updated on 2026-06-17.

CVE-2020-5840

CVE-2020-5840 is a high-severity vulnerability in Hashbrowncms Hashbrown Cms 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-22.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Hashbrowncms Hashbrown Cms
Published: 2020-01-06
Last modified: 2026-06-17

Description

An issue was discovered in HashBrown CMS before 1.3.2. Server/Entity/Resource/Connection.js allows an attacker to reach a parent directory via a crafted name or ID field.

Frequently asked questions

What is CVE-2020-5840?: An issue was discovered in HashBrown CMS before 1.3.2. Server/Entity/Resource/Connection.js allows an attacker to reach a parent directory via a crafted name or ID field.
How severe is CVE-2020-5840?: CVE-2020-5840 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-2020-5840 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5840?: CVE-2020-5840 affects Hashbrowncms Hashbrown Cms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-5840?: 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-2020-5840 published?: CVE-2020-5840 was published on 2020-01-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hashbrowncms:hashbrown_cms:*:*:*:*:*:*:*:*

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