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CVE-2021-4072

21
FAUCET Score

CVE-2021-4072 describes a Cross-site Scripting (XSS) vulnerability in the Elgg social networking engine, specifically due to improper neutralization of user input during web page generation. This medium-severity vulnerability (CVSS 5.4) requires user interaction and low privileges, allowing an attacker to potentially inject malicious scripts, leading to limited impact on confidentiality and integrity. There is currently no evidence of active exploitation, nor are there publicly available exploit modules or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.3.24CPE matchmatch criteria
cpe:2.3:a:elgg:elgg:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.0CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.3
Impact Score
6.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.70%
Probability of exploitation in next 30 days
EPSS Percentile
49.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0070 is in the 83rd percentile among its peer group of 15,224 CVEs.

Social Chatter

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

Remediation

Patch Available

Vendor Patches (2)

composerpatch availablevia ghsa
Product: elgg/elggFixed in: 3.3.24
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-2xw8-j43j-5vxpmedium

elgg is vulnerable to Cross-site Scripting

Jan 6, 2022

References

github.com / elgg/elgg/commit/c30b17bf75256ed3fcc84e2083147cc3951423d0
PatchThird Party Advisory
huntr.dev / bounties/74034253-732a-4251-a0f9-eca5f576c955
ExploitIssue TrackingPatchThird Party Advisory