Vulnerability-Lookup

GHSA-GRJP-4JMR-MJCW

Vulnerability from github – Published: 2022-09-27 00:00 – Updated: 2022-09-30 04:42

Summary

express-xss-sanitizer vulnerable to Prototype Pollution via allowedTags attribute

Details

The package express-xss-sanitizer before 1.1.3 is vulnerable to Prototype Pollution via the allowedTags attribute, allowing the attacker to bypass xss sanitization.

Severity

6.1 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "express-xss-sanitizer"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2022-21169"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2022-09-30T04:42:55Z",
    "nvd_published_at": "2022-09-26T05:15:00Z",
    "severity": "MODERATE"
  },
  "details": "The package express-xss-sanitizer before 1.1.3 is vulnerable to Prototype Pollution via the `allowedTags` attribute, allowing the attacker to bypass xss sanitization.",
  "id": "GHSA-grjp-4jmr-mjcw",
  "modified": "2022-09-30T04:42:55Z",
  "published": "2022-09-27T00:00:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-21169"
    },
    {
      "type": "WEB",
      "url": "https://github.com/AhmedAdelFahim/express-xss-sanitizer/issues/4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/AhmedAdelFahim/express-xss-sanitizer/commit/3bf8aaaf4dbb1c209dcb8d87a82711a54c1ab39a"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/AhmedAdelFahim/express-xss-sanitizer"
    },
    {
      "type": "WEB",
      "url": "https://runkit.com/embed/w306l6zfm7tu"
    },
    {
      "type": "WEB",
      "url": "https://security.snyk.io/vuln/SNYK-JS-EXPRESSXSSSANITIZER-3027443"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "express-xss-sanitizer vulnerable to Prototype Pollution via allowedTags attribute"
}

CVE-2022-21169 (GCVE-0-2022-21169)

Vulnerability from cvelistv5 – Published: 2022-09-26 05:05 – Updated: 2025-05-21 20:29

Title

Prototype Pollution

Summary

The package express-xss-sanitizer before 1.1.3 are vulnerable to Prototype Pollution via the allowedTags attribute, allowing the attacker to bypass xss sanitization.

Severity

7.3 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-05-21 20:29 UTC

CWE

Prototype Pollution
CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Assigner

snyk mitre root

References

4 references

URL	Tags
https://security.snyk.io/vuln/SNYK-JS-EXPRESSXSSS…	x_refsource_MISC
https://github.com/AhmedAdelFahim/express-xss-san…	x_refsource_MISC
https://runkit.com/embed/w306l6zfm7tu	x_refsource_MISC
https://github.com/AhmedAdelFahim/express-xss-san…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
n/a	express-xss-sanitizer	Affected: unspecified , < 1.1.3 (custom)

Date Public

2022-09-26 00:00

Credits

Jayateertha Guruprasad

Show details on NVD website

JSON

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        "references": [
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            "url": "https://security.snyk.io/vuln/SNYK-JS-EXPRESSXSSSANITIZER-3027443"
          },
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            "tags": [
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            ],
            "url": "https://github.com/AhmedAdelFahim/express-xss-sanitizer/issues/4"
          },
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            "url": "https://runkit.com/embed/w306l6zfm7tu"
          },
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            "url": "https://github.com/AhmedAdelFahim/express-xss-sanitizer/commit/3bf8aaaf4dbb1c209dcb8d87a82711a54c1ab39a"
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                "id": "CVE-2022-21169",
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                "timestamp": "2025-05-21T20:29:10.261035Z",
                "version": "2.0.3"
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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