What is CVE-2021-3980?

CVE-2021-3980 is a high-severity vulnerability in Elgg, classified under Exposure of Private Personal Information to an Unauthorized Actor. CVSS score: 7.5/10. Published 2021-12-03.

How severe is CVE-2021-3980?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2021-3980 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Elgg

CVE-2021-3980

elgg is vulnerable to Exposure of Private Personal Information to an Unauthorized Actor

Published 2021-12-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.016 (74.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.016 · change: +0.001

Affected products

Elgg
Elgg Elgg/elgg — versions unspecified

Weakness classification (CWE)

CWE-359 — Exposure of Private Personal Information to an Unauthorized Actor

Public proof-of-concept exploits

soxoj/information-disclosure-writeups-and-pocs

References

huntr.dev/bounties/1f43f11e-4bd8-451f-a244-dc9541cdc0ac (Exploit, Third Party Advisory)
github.com/elgg/elgg/commit/572d210e2392f1fdf47ff2f38665372a6535c126 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3980?: CVE-2021-3980 is a high-severity vulnerability in Elgg, classified under Exposure of Private Personal Information to an Unauthorized Actor. CVSS score: 7.5/10. Published 2021-12-03.
How severe is CVE-2021-3980?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-3980 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.