How severe is CVE-2021-3728?

CVE-2021-3728 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2021-3728 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3728?

CVE-2021-3728 affects Firefly-iii Firefly Iii. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3728?

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

When was CVE-2021-3728 published?

CVE-2021-3728 was published on 2021-08-23 and last updated on 2026-06-17.

CVE-2021-3728

CVE-2021-3728 is a medium-severity vulnerability in Firefly-iii Firefly Iii with a CVSS 3.x base score of 6.5. 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-352.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (39th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Firefly-iii Firefly Iii
Published: 2021-08-23
Last modified: 2026-06-17

Description

firefly-iii is vulnerable to Cross-Site Request Forgery (CSRF)

Frequently asked questions

What is CVE-2021-3728?: firefly-iii is vulnerable to Cross-Site Request Forgery (CSRF)
How severe is CVE-2021-3728?: CVE-2021-3728 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2021-3728 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3728?: CVE-2021-3728 affects Firefly-iii Firefly Iii. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3728?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-3728 published?: CVE-2021-3728 was published on 2021-08-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:firefly-iii:firefly_iii:-:*:*:*:*:*:*:*

More vulnerabilities in Firefly-iii Firefly Iii

CVE-2023-1788 — Critical (CVSS 9.8): Insufficient Session Expiration in GitHub repository firefly-iii/firefly-iii prior to 6.
CVE-2023-1789 — Critical (CVSS 9.8): Improper Input Validation in GitHub repository firefly-iii/firefly-iii prior to 6.0.0.
CVE-2021-3901 — High (CVSS 8.8): firefly-iii is vulnerable to Cross-Site Request Forgery (CSRF)
CVE-2021-3846 — High (CVSS 8.8): firefly-iii is vulnerable to Unrestricted Upload of File with Dangerous Type
CVE-2021-3819 — High (CVSS 8.8): firefly-iii is vulnerable to Cross-Site Request Forgery (CSRF)
CVE-2021-3663 — High (CVSS 7.5): firefly-iii is vulnerable to Improper Restriction of Excessive Authentication Attempts

All CVEs affecting Firefly-iii Firefly Iii →

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