How severe is CVE-2020-29240?

CVE-2020-29240 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-2020-29240 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-29240?

CVE-2020-29240 affects Lepton-cms Leptoncms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-29240?

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

When was CVE-2020-29240 published?

CVE-2020-29240 was published on 2020-12-02 and last updated on 2026-06-17.

CVE-2020-29240

CVE-2020-29240 is a medium-severity vulnerability in Lepton-cms Leptoncms 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: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Lepton-cms Leptoncms
Published: 2020-12-02
Last modified: 2026-06-17

Description

Lepton-CMS 4.7.0 is affected by cross-site scripting (XSS). An attacker can inject the XSS payload in the URL field of the admin page and each time an admin visits the Menu-Pages-Pages Overview section, the XSS will be triggered.

Frequently asked questions

What is CVE-2020-29240?: Lepton-CMS 4.7.0 is affected by cross-site scripting (XSS). An attacker can inject the XSS payload in the URL field of the admin page and each time an admin visits the Menu-Pages-Pages Overview section, the XSS will be triggered.
How severe is CVE-2020-29240?: CVE-2020-29240 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-2020-29240 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-29240?: CVE-2020-29240 affects Lepton-cms Leptoncms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-29240?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-29240 published?: CVE-2020-29240 was published on 2020-12-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:lepton-cms:leptoncms:4.7.0:*:*:*:*:*:*:*

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