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CVE-2021-4256

20
FAUCET Score

CVE-2021-4256 is a Cross-Site Scripting (XSS) vulnerability affecting ctrlo lenio, specifically within the views/index.tt file. This flaw allows remote attackers to inject malicious scripts by manipulating the task.name or task.site.org.name arguments. It carries a CVSS score of 6.1 (Medium), indicating it can be exploited over the network with low complexity, requiring user interaction, and potentially leading to low impact on confidentiality and integrity. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2021-02-08CPE matchmatch criteria
cpe:2.3:a:ctrlo:lenio:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

3.5LOW

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.1
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.39%
Probability of exploitation in next 30 days
EPSS Percentile
31.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0039 is in the 32nd 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 (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / ctrlo/lenio/commit/e1646d5cd0a2fbab9eb505196dd2ca1c9e4cdd97
PatchThird Party Advisory
vuldb.com
Third Party Advisory