How severe is CVE-2020-13978?

CVE-2020-13978 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-13978 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-13978?

CVE-2020-13978 affects Monstra Monstra Cms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-13978?

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-2020-13978 published?

CVE-2020-13978 was published on 2020-06-09 and last updated on 2026-06-17.

CVE-2020-13978

CVE-2020-13978 is a high-severity vulnerability in Monstra Monstra Cms with a CVSS 3.x base score of 7.2. 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-78.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 6.5
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Monstra Monstra Cms
Published: 2020-06-09
Last modified: 2026-06-17

Description

Monstra CMS 3.0.4 allows an attacker, who already has administrative access to modify .chunk.php files on the Edit Chunk screen, to execute arbitrary OS commands via the Theme Module by visiting the admin/index.php?id=themes&action=edit_chunk URI. NOTE: there is no indication that the Edit Chunk feature was intended to prevent an administrator from using PHP's exec feature

Frequently asked questions

What is CVE-2020-13978?: Monstra CMS 3.0.4 allows an attacker, who already has administrative access to modify .chunk.php files on the Edit Chunk screen, to execute arbitrary OS commands via the Theme Module by visiting the admin/index.php?id=themes&action=edit_chunk URI. NOTE: there is no indication that the Edit Chunk feature was intended to prevent an administrator from using PHP's exec feature
How severe is CVE-2020-13978?: CVE-2020-13978 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-13978 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-13978?: CVE-2020-13978 affects Monstra Monstra Cms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-13978?: 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-2020-13978 published?: CVE-2020-13978 was published on 2020-06-09 and last updated on 2026-06-17.

References

https://github.com/monstra-cms/monstra/issues/464

Affected products (1)

cpe:2.3:a:monstra:monstra_cms:3.0.4:*:*:*:*:*:*:*

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