CVE-2021-3964 json
Authorization Bypass Through User-Controlled Key in elgg/elgg
published 2021-12-01 4 y ago modified 2026-06-17 4 mo ago also GHSA-gwpx-q2h9-wxgx , EUVD-2021-2525
- cvss
- 4.3
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 57%
- public exploits
- 0
- none known
Summary
elgg is vulnerable to Authorization Bypass Through User-Controlled Key
Patch / fix
- packagist elgg/elgg 3.3.22
- elgg elgg/elgg 3.3.22
Exploit prediction
0.80% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- huntr.dev https://huntr.dev/bounties/a4df45d6-b739-4299-967f-c960b569383a referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 4.3 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
| NVD | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
| GitHub | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | elgg/elgg | <3.3.22 |
3.3.22 |
Affected products
- elgg elgg/elgg
Classification
- Weakness
-
- CWE-639 Authorization Bypass Through User-Controlled Key
References
-
github.com
/elgg/elgg/commit/d9fcad76ee380ea17edd61d13d0f87828ea3f744
web, patch, third-party-advisory
-
huntr.dev
/bounties/a4df45d6-b739-4299-967f-c960b569383a
web, exploit, patch, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-3964
advisory
-
github.com
/elgg/elgg
web
Sources
- CVE List CVE-2021-3964
- GitHub Advisory GHSA-gwpx-q2h9-wxgx
- NVD CVE-2021-3964
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.