CWE · MITRE source
CWE-551Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
If a web server does not fully parse requested URLs before it examines them for authorization, it may be possible for an attacker to bypass authorization protection.
For instance, the character strings /./ and / both mean current directory. If /SomeDirectory is a protected directory and an attacker requests /./SomeDirectory, the attacker may be able to gain access to the resource if /./ is not converted to / before the authorization check is performed.
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: partial · 1 mapping(s) from 1 framework(s): ATT&CK 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-2021-28164 | 8.0 | 5.3 | 0.8237 | 2021-04-01 |
CVE-2021-28165 | 8.0 | 7.5 | 0.5386 | 2021-04-01 |
CVE-2021-34429 | 8.0 | 5.3 | 0.9930 | 2021-07-15 |
CVE-2023-23924 | 7.0 | 10.0 | 0.0357 | 2023-02-01 |
CVE-2026-2293 UPD | 7.0 | 9.8 | 0.0067 | 2026-02-27 |
CVE-2016-20030 UPD | 7.0 | 9.8 | 0.0056 | 2026-03-16 |
CVE-2026-33186 UPD | 7.0 | 9.1 | 0.0156 | 2026-03-20 |
CVE-2026-28808 UPD | 7.0 | 9.8 | 0.0053 | 2026-04-07 |
CVE-2021-32777 | 5.5 | 8.6 | 0.0333 | 2021-08-24 |
CVE-2021-32779 | 5.5 | 8.6 | 0.0095 | 2021-08-24 |
CVE-2021-31384 | 5.5 | 7.2 | 0.0112 | 2021-10-19 |
CVE-2026-4636 UPD | 5.5 | 8.1 | 0.0035 | 2026-04-02 |
CVE-2026-22754 UPD | 5.5 | 7.5 | 0.0027 | 2026-04-22 |
CVE-2026-40022 UPD | 5.5 | 8.2 | 0.0062 | 2026-04-27 |
CVE-2026-39852 UPD | 5.5 | 8.2 | 0.0043 | 2026-05-05 |
CVE-2026-44573 UPD | 5.5 | 7.5 | 0.0055 | 2026-05-13 |
CVE-2026-44574 UPD | 5.5 | 8.1 | 0.0045 | 2026-05-13 |
CVE-2026-44575 UPD | 5.5 | 7.5 | 0.0142 | 2026-05-13 |
CVE-2026-45832 UPD | 5.5 | 8.8 | 0.0028 | 2026-06-12 |
CVE-2026-50559 UPD | 5.5 | 7.5 | 0.0039 | 2026-06-19 |
CVE-2026-57920 | 5.5 | 7.7 | 0.0022 | 2026-06-26 |
CVE-2026-13676 | 5.5 | 7.5 | 0.0027 | 2026-06-29 |
CVE-2026-0707 UPD | 3.5 | 5.3 | 0.0036 | 2026-01-08 |