CWE-76
AllowedImproper Neutralization of Equivalent Special Elements
Abstraction: Base · Status: Draft
The product correctly neutralizes certain special elements, but it improperly neutralizes equivalent special elements.
22 vulnerabilities reference this CWE, most recent first.
GHSA-H5WQ-XQ9G-PPPC
Vulnerability from github – Published: 2023-03-02 06:30 – Updated: 2023-03-10 18:30Improper Neutralization of Equivalent Special Elements in GitHub repository btcpayserver/btcpayserver prior to 1.8.0.
{
"affected": [],
"aliases": [
"CVE-2023-1149"
],
"database_specific": {
"cwe_ids": [
"CWE-76"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-03-02T05:15:00Z",
"severity": "MODERATE"
},
"details": "Improper Neutralization of Equivalent Special Elements in GitHub repository btcpayserver/btcpayserver prior to 1.8.0.",
"id": "GHSA-h5wq-xq9g-pppc",
"modified": "2023-03-10T18:30:19Z",
"published": "2023-03-02T06:30:14Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-1149"
},
{
"type": "WEB",
"url": "https://github.com/btcpayserver/btcpayserver/commit/ddb125f45892b4dafdbd5c072af1ce623758bb92"
},
{
"type": "WEB",
"url": "https://huntr.dev/bounties/2e734209-d7b0-4f57-a8be-c65c82208f2f"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-WXXQ-MWHH-CVM2
Vulnerability from github – Published: 2026-07-15 15:33 – Updated: 2026-07-15 15:33When NGINX Ingress Controller is configured with Custom Resource Definitions (CRDs) or Ingress annotations, an injection vulnerability exists in the configuration generator of NGINX Ingress Controller. Multiple user-controllable fields are written into the generated NGINX configuration without sanitization. An authenticated attacker with permission to create or modify these CRDs or annotations may craft values that inject arbitrary NGINX configuration directives.
Impact: An authenticated attacker granted write access to NGINX Ingress Controller CRDs or Ingress annotations through the Kubernetes API may be able to inject arbitrary NGINX configuration directives, create or delete files, or disable services. There is no data plane exposure; this is a control plane issue only.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
{
"affected": [],
"aliases": [
"CVE-2026-55723"
],
"database_specific": {
"cwe_ids": [
"CWE-76"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-15T15:16:45Z",
"severity": "HIGH"
},
"details": "When NGINX Ingress Controller is configured with Custom Resource Definitions (CRDs) or Ingress annotations, an injection vulnerability exists in the configuration generator of NGINX Ingress Controller. Multiple user-controllable fields are written into the generated NGINX configuration without sanitization. An authenticated attacker with permission to create or modify these CRDs or annotations may craft values that inject arbitrary NGINX configuration directives. \n\nImpact:\nAn authenticated attacker granted write access to NGINX Ingress Controller CRDs or Ingress annotations through the Kubernetes API may be able to inject arbitrary NGINX configuration directives, create or delete files, or disable services. There is no data plane exposure; this is a control plane issue only.\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.",
"id": "GHSA-wxxq-mwhh-cvm2",
"modified": "2026-07-15T15:33:07Z",
"published": "2026-07-15T15:33:07Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55723"
},
{
"type": "WEB",
"url": "https://my.f5.com/manage/s/article/K000161800"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
]
}
Mitigation
Programming languages and supporting technologies might be chosen which are not subject to these issues.
Mitigation
Utilize an appropriate mix of allowlist and denylist parsing to filter equivalent special element syntax from all input.
No CAPEC attack patterns related to this CWE.