How severe is CVE-2018-10121?

CVE-2018-10121 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2018-10121 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-10121?

CVE-2018-10121 affects Monstra. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-10121?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-10121 published?

CVE-2018-10121 was published on 2018-04-16 and last updated on 2026-06-17.

CVE-2018-10121

CVE-2018-10121 is a medium-severity vulnerability in Monstra with a CVSS 3.x base score of 4.8. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
CVSS v2: 3.5
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Monstra
Published: 2018-04-16
Last modified: 2026-06-17

Description

plugins/box/pages/pages.admin.php in Monstra CMS 3.0.4 has a stored XSS vulnerability when an attacker has access to the editor role, and enters the payload in the title section of an admin/index.php?id=pages&action=edit_page&name=error404 (aka Edit 404 page) action.

Frequently asked questions

What is CVE-2018-10121?: plugins/box/pages/pages.admin.php in Monstra CMS 3.0.4 has a stored XSS vulnerability when an attacker has access to the editor role, and enters the payload in the title section of an admin/index.php?id=pages&action=edit_page&name=error404 (aka Edit 404 page) action.
How severe is CVE-2018-10121?: CVE-2018-10121 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2018-10121 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-10121?: CVE-2018-10121 affects Monstra. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-10121?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-10121 published?: CVE-2018-10121 was published on 2018-04-16 and last updated on 2026-06-17.

References

https://github.com/monstra-cms/monstra/issues/437

Affected products (1)

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

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