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CVE-2021-3728

22
FAUCET Score

CVE-2021-3728 describes a Cross-Site Request Forgery (CSRF) vulnerability affecting firefly-iii. This medium-severity flaw (CVSS 6.5) allows an unauthenticated attacker to induce a user to perform unintended actions by tricking them into clicking a malicious link, potentially leading to high integrity impact. While no public exploits or active exploitation have been observed, and community discussion is minimal, organizations using firefly-iii should be aware of this risk.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:firefly-iii:firefly_iii:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.50%
Probability of exploitation in next 30 days
EPSS Percentile
40.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0050 is in the 42nd percentile among its peer group of 26,219 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

composerpatch availablevia ghsa
Product: grumpydictator/firefly-iiiFixed in: 5.6.0
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-xp5q-77mh-6hm2medium

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

Aug 25, 2021

References

github.com / firefly-iii/firefly-iii/commit/14cdce113e0eb8090d09066fcd2b5cf03b5ac84e
Patch
huntr.dev / bounties/dd54c5a1-0d4a-4f02-a111-7ce4ddc67a4d
ExploitThird Party Advisory