How severe is CVE-2023-3521?

CVE-2023-3521 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2023-3521 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-3521?

CVE-2023-3521 affects Fossbilling. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-3521?

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

When was CVE-2023-3521 published?

CVE-2023-3521 was published on 2023-07-06 and last updated on 2026-06-17.

CVE-2023-3521

CVE-2023-3521 is a medium-severity vulnerability in Fossbilling with a CVSS 3.x base score of 6.1. 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 6.1)
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Fossbilling
Published: 2023-07-06
Last modified: 2026-06-17

Description

Cross-site Scripting (XSS) - Reflected in GitHub repository fossbilling/fossbilling prior to 0.5.4.

Frequently asked questions

What is CVE-2023-3521?: Cross-site Scripting (XSS) - Reflected in GitHub repository fossbilling/fossbilling prior to 0.5.4.
How severe is CVE-2023-3521?: CVE-2023-3521 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2023-3521 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-3521?: CVE-2023-3521 affects Fossbilling. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-3521?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-3521 published?: CVE-2023-3521 was published on 2023-07-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:fossbilling:fossbilling:*:*:*:*:*:*:*:*

More vulnerabilities in Fossbilling

CVE-2023-4005 — Critical (CVSS 9.8): Insufficient Session Expiration in GitHub repository fossbilling/fossbilling prior to 0.5.5.
CVE-2023-3490 — Critical (CVSS 9.8): SQL Injection in GitHub repository fossbilling/fossbilling prior to 0.5.3.
CVE-2023-3491 — High (CVSS 8.8): Unrestricted Upload of File with Dangerous Type in GitHub repository fossbilling/fossbilling prior to 0.5.3.
CVE-2023-3493 — High (CVSS 8.0): Improper Neutralization of Formula Elements in a CSV File in GitHub repository fossbilling/fossbilling prior to 0.5.3.
CVE-2023-3230 — High (CVSS 7.5): Missing Authorization in GitHub repository fossbilling/fossbilling prior to 0.5.0.
CVE-2023-3393 — High (CVSS 7.2): Code Injection in GitHub repository fossbilling/fossbilling prior to 0.5.1.

All CVEs affecting Fossbilling →

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