CWE · MITRE source
CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.
Last updated: 04 July 2026 00:28 UTC
Cumulative inbound coverage
How completely the frameworks we cross-walk collectively cover this — the verdict is the strongest single mapping (overlapping partials are not summed); breadth shows the corroboration behind it.
Collective: full · 5 mapping(s) from 3 framework(s): ATT&CK 3 (mostly) · ASVS 5.0 1 (full) · CAPEC 1 (partial)
NIST 800-53 r5 controls that address this weakness (0)AI
| Control | Title | Family | Why it addresses this CWE |
|---|---|---|---|
| No NIST controls proposed yet. | |||
MITRE ATT&CK techniques this weakness enables
Our own two-way CWE↔ATT&CK cross-walk — a direct mapping with no public source (the CWE→CAPEC→ATT&CK chain leaves most top weaknesses, incl. XSS and SQLi, mapped to nothing). Drafted by Grok and spot-checked by Claude Opus 4.8.
Direction: ← other covers this;
→ this covers other (F/M/P = full / mostly /
partial).
Top CVEs of this weakness type, ranked by Risk Priority
| CVE | Risk | CVSS | EPSS | Published |
|---|---|---|---|---|
CVE-2026-34621 KEV | 10.0 | 8.6 | 0.0709 | 2026-04-11 |
CVE-2019-11358 | 8.0 | 6.1 | 0.8722 | 2019-04-20 |
CVE-2019-0230 | 8.0 | 9.8 | 0.9740 | 2020-09-14 |
CVE-2020-7774 | 8.0 | 7.3 | 0.6906 | 2020-11-17 |
CVE-2019-10744 | 7.0 | 9.1 | 0.0501 | 2019-07-26 |
CVE-2019-14379 | 7.0 | 9.8 | 0.0804 | 2019-07-29 |
CVE-2019-19919 | 7.0 | 9.8 | 0.0707 | 2019-12-20 |
CVE-2020-12079 | 7.0 | 10.0 | 0.0223 | 2020-04-23 |
CVE-2020-7700 | 7.0 | 9.8 | 0.0192 | 2020-08-14 |
CVE-2020-7701 | 7.0 | 9.8 | 0.0205 | 2020-08-14 |
CVE-2020-7702 | 7.0 | 9.8 | 0.0193 | 2020-08-17 |
CVE-2020-7703 | 7.0 | 9.8 | 0.0193 | 2020-08-17 |
CVE-2020-7704 | 7.0 | 9.8 | 0.0270 | 2020-08-17 |
CVE-2020-7706 | 7.0 | 9.8 | 0.0280 | 2020-08-18 |
CVE-2020-7707 | 7.0 | 9.8 | 0.0338 | 2020-08-18 |
CVE-2020-7708 | 7.0 | 9.8 | 0.0282 | 2020-08-18 |
CVE-2020-7713 | 7.0 | 9.8 | 0.0192 | 2020-09-01 |
CVE-2020-7714 | 7.0 | 9.8 | 0.0192 | 2020-09-01 |
CVE-2020-7715 | 7.0 | 9.8 | 0.0197 | 2020-09-01 |
CVE-2020-7716 | 7.0 | 9.8 | 0.0192 | 2020-09-01 |
CVE-2020-7717 | 7.0 | 9.8 | 0.0192 | 2020-09-01 |
CVE-2020-7718 | 7.0 | 9.8 | 0.0192 | 2020-09-01 |
CVE-2020-7719 | 7.0 | 9.8 | 0.0275 | 2020-09-01 |
CVE-2020-7720 | 7.0 | 9.8 | 0.0316 | 2020-09-01 |
CVE-2020-7721 | 7.0 | 9.8 | 0.0192 | 2020-09-01 |