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CVE-2021-3985

28
FAUCET Score

CVE-2021-3985 describes a critical cross-site scripting (XSS) vulnerability (CWE-79) in Kimai2, a time-tracking software. This flaw allows an attacker to inject malicious scripts into web pages due to improper neutralization of user input. With a CVSS v3.1 score of 9.0 (Critical), successful exploitation could lead to high impact on confidentiality, integrity, and availability, requiring low privileges and user interaction over a network. While no public exploits, Metasploit modules, or Nuclei templates are currently available, and there's minimal community discussion or media coverage, organizations using Kimai2 should prioritize patching to mitigate this significant risk.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.16.3CPE matchmatch criteria
cpe:2.3:a:kimai:kimai2:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.0HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.1
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.22%
Probability of exploitation in next 30 days
EPSS Percentile
65.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0122 is in the 77th percentile among its peer group of 265 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.6 Bluesky, 0.3 Mastodon, and 1.6 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: kevinpapst/kimai2Fixed in: 1.16.3
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-x68c-4gmm-5g43high

kimai2 is vulnerable to Cross-site Scripting

Dec 3, 2021

References

github.com / kevinpapst/kimai2/commit/76e09447c85e762882126b49626a4fe4d93fe8b5
PatchThird Party Advisory
huntr.dev / bounties/89d6c3de-efbd-4354-8cc8-46e999e4c5a4
ExploitPatchThird Party Advisory