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CVE-2021-3901

28
FAUCET Score

CVE-2021-3901 describes a Cross-Site Request Forgery (CSRF) vulnerability affecting firefly-iii. This high-severity vulnerability, rated 8.8 CVSS, allows an unauthenticated attacker to execute arbitrary actions on behalf of an authenticated user with high impact on confidentiality, integrity, and availability, requiring user interaction. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 5.6.2CPE matchmatch criteria
cpe:2.3:a:firefly-iii:firefly_iii:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

3.5LOW

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
2.1
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.54%
Probability of exploitation in next 30 days
EPSS Percentile
42.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0054 is in the 44th percentile among its peer group of 14,848 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-rqgp-ccph-5w65low

Cross-Site Request Forgery in firefly-iii

Oct 28, 2021

References

github.com / firefly-iii/firefly-iii/commit/b42d8d1e305cad70d9b83b33cd8e0d7a4b2060c2
PatchThird Party Advisory
huntr.dev / bounties/62508fdc-c26b-4312-bf75-fd3a3f997464
ExploitIssue TrackingPatchThird Party Advisory