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CVE-2021-3964

21
FAUCET Score

CVE-2021-3964 describes an authorization bypass vulnerability in elgg, allowing attackers to manipulate user-controlled keys to gain unauthorized access. This medium-severity flaw (CVSS 5.9) has a network attack vector and high impact on integrity, but requires high attack complexity. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.3.22CPE matchmatch criteria
cpe:2.3:a:elgg:elgg:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

4.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.78%
Probability of exploitation in next 30 days
EPSS Percentile
52.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0078 is in the 11th percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 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: 3.3.22
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-gwpx-q2h9-wxgxmedium

elgg is vulnerable to Authorization Bypass Through User-Controlled Key

Dec 3, 2021

References

github.com / elgg/elgg/commit/d9fcad76ee380ea17edd61d13d0f87828ea3f744
PatchThird Party Advisory
huntr.dev / bounties/a4df45d6-b739-4299-967f-c960b569383a
ExploitPatchThird Party Advisory