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CVE-2021-42112

21
FAUCET Score

CVE-2021-42112 describes a Cross-Site Scripting (XSS) vulnerability in the "File upload question" functionality of LimeSurvey 3.x-LTS versions up to 3.27.18, specifically within the modaldialog.js and uploader.js files. This medium-severity vulnerability (CVSS 6.1) can be exploited remotely with low attack complexity, requiring user interaction, and could lead to limited confidentiality and integrity impacts. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 3.0.0, <= 3.27.18CPE matchmatch criteria
cpe:2.3:a:limesurvey:limesurvey:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.48%
Probability of exploitation in next 30 days
EPSS Percentile
71.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0148 is in the 84th percentile among its peer group of 26,236 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: limesurvey/limesurveyFixed in: 3.27.19
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-h9ph-jcgh-gf69medium

Cross-site Scripting in Limesurvey

Oct 12, 2021

References

bugs.limesurvey.org / view.php
Permissions Required
github.com / LimeSurvey/LimeSurvey/commit/d56619a50cfd191bbffd0adb660638a5e438070d
PatchThird Party Advisory
on-x.com / sites/default/files/on-x_-_security_advisory_-_limesurvey_-_cve-2021-42112.pdf
ExploitThird Party Advisory