Vulnerability-Lookup

FKIE_CVE-2026-73374

Vulnerability from fkie_nvd - Published: 2026-08-12 15:18 - Updated: 2026-08-12 18:18

Severity

6.1 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:H/SI:N/SA:N

Summary

A stored cross-site scripting (XSS) vulnerability existed in Vulnerability-Lookup in the render_tag_badges Jinja filter used to display reference tags associated with vulnerability records. Values from containers.cna.references[].tags[] were directly interpolated into HTML badge elements and the resulting string was wrapped in markupsafe.Markup. Because Markup marks the generated content as safe, Jinja's automatic HTML escaping was bypassed. An authenticated user with permissions to create or modify vulnerability records, such as a user holding the vulnerability:create or vulnerability:modify permission, could submit a crafted reference tag through the CNA API containing arbitrary HTML or JavaScript-capable markup. The malicious value would subsequently be stored as part of the vulnerability record. When another user visited the corresponding public /cve/<id> or /vuln/<id> page, the crafted tag would be rendered as HTML in the viewer's browser. This could result in JavaScript execution in the security context of the Vulnerability-Lookup application. Successful exploitation could allow an attacker to perform actions in the context of a victim, access information available to the victim's browser session, or modify page content. As the affected vulnerability pages can be accessed publicly, exploitation may affect users who are not authenticated. The issue was corrected by applying markupsafe.escape() to each reference tag before inserting it into the HTML badge markup, while retaining Markup only for the static HTML scaffolding.

References

	URL	Tags
	5a6e4751-2f3f-4070-9419-94fb35b644e8	https://github.com/vulnerability-lookup/vulnerability-lookup/commit/d29901655c50cf3c25737d9ea86180268df51b57

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "vulnerability-lookup",
          "repo": "https://github.com/vulnerability-lookup/vulnerability-lookup",
          "vendor": "vulnerability-lookup",
          "versions": [
            {
              "lessThanOrEqual": "5.5.1",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A stored cross-site scripting (XSS) vulnerability existed in Vulnerability-Lookup in the render_tag_badges Jinja filter used to display reference tags associated with vulnerability records.\n\nValues from containers.cna.references[].tags[] were directly interpolated into HTML badge elements and the resulting string was wrapped in markupsafe.Markup. Because Markup marks the generated content as safe, Jinja\u0027s automatic HTML escaping was bypassed.\n\nAn authenticated user with permissions to create or modify vulnerability records, such as a user holding the vulnerability:create or vulnerability:modify permission, could submit a crafted reference tag through the CNA API containing arbitrary HTML or JavaScript-capable markup.\n\nThe malicious value would subsequently be stored as part of the vulnerability record. When another user visited the corresponding public /cve/\u003cid\u003e or /vuln/\u003cid\u003e page, the crafted tag would be rendered as HTML in the viewer\u0027s browser. This could result in JavaScript execution in the security context of the Vulnerability-Lookup application.\n\nSuccessful exploitation could allow an attacker to perform actions in the context of a victim, access information available to the victim\u0027s browser session, or modify page content. As the affected vulnerability pages can be accessed publicly, exploitation may affect users who are not authenticated.\n\nThe issue was corrected by applying markupsafe.escape() to each reference tag before inserting it into the HTML badge markup, while retaining Markup only for the static HTML scaffolding."
    }
  ],
  "id": "CVE-2026-73374",
  "lastModified": "2026-08-12T18:18:15.637",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "HIGH",
          "subIntegrityImpact": "NONE",
          "userInteraction": "ACTIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:H/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-73374",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-12T17:12:10.763639Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-12T15:18:33.173",
  "references": [
    {
      "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
      "url": "https://github.com/vulnerability-lookup/vulnerability-lookup/commit/d29901655c50cf3c25737d9ea86180268df51b57"
    }
  ],
  "sourceIdentifier": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
      "type": "Secondary"
    }
  ]
}

CVE-2026-73374 (GCVE-0-2026-73374)

Vulnerability from cvelistv5 – Published: 2026-08-12 14:05 – Updated: 2026-08-12 17:12

Title

Stored Cross-Site Scripting (XSS) via Unescaped CNA Reference Tags in vulnerability-lookup

Summary

Severity

6.1 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:H/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-12 17:12 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')

Assigner

CIRCL

References

1 reference

URL	Tags
https://github.com/vulnerability-lookup/vulnerabi…	patch

Impacted products

1 product

Vendor	Product	Version
vulnerability-lookup	vulnerability-lookup	Affected: 0 , ≤ 5.5.1 (semver)

Credits

openai/gpt-5.5-cyber-preview (reasoning level: high) EUVD @ ENISA Team Cedric Bonhomme Alexandre Dulaunoy

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-73374",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-12T17:12:10.763639Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-12T17:12:36.380Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "vulnerability-lookup",
          "repo": "https://github.com/vulnerability-lookup/vulnerability-lookup",
          "vendor": "vulnerability-lookup",
          "versions": [
            {
              "lessThanOrEqual": "5.5.1",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "tool",
          "value": "openai/gpt-5.5-cyber-preview (reasoning level: high)"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "EUVD @ ENISA Team"
        },
        {
          "lang": "en",
          "type": "remediation reviewer",
          "value": "Cedric Bonhomme"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "Alexandre Dulaunoy"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eA stored cross-site scripting (XSS) vulnerability existed in \u003cstrong\u003eVulnerability-Lookup\u003c/strong\u003e in the \u003ccode\u003erender_tag_badges\u003c/code\u003e Jinja filter used to display reference tags associated with vulnerability records.\u003c/p\u003e\u003cp\u003eValues from \u003ccode\u003econtainers.cna.references[].tags[]\u003c/code\u003e were directly interpolated into HTML badge elements and the resulting string was wrapped in \u003ccode\u003emarkupsafe.Markup\u003c/code\u003e. Because \u003ccode\u003eMarkup\u003c/code\u003e marks the generated content as safe, Jinja\u0027s automatic HTML escaping was bypassed.\u003c/p\u003e\u003cp\u003eAn authenticated user with permissions to create or modify vulnerability records, such as a user holding the \u003ccode\u003evulnerability:create\u003c/code\u003e or \u003ccode\u003evulnerability:modify\u003c/code\u003e permission, could submit a crafted reference tag through the CNA API containing arbitrary HTML or JavaScript-capable markup.\u003c/p\u003e\u003cp\u003eThe malicious value would subsequently be stored as part of the vulnerability record. When another user visited the corresponding public \u003ccode\u003e/cve/\u0026lt;id\u0026gt;\u003c/code\u003e or \u003ccode\u003e/vuln/\u0026lt;id\u0026gt;\u003c/code\u003e page, the crafted tag would be rendered as HTML in the viewer\u0027s browser. This could result in JavaScript execution in the security context of the Vulnerability-Lookup application.\u003c/p\u003e\u003cp\u003eSuccessful exploitation could allow an attacker to perform actions in the context of a victim, access information available to the victim\u0027s browser session, or modify page content. As the affected vulnerability pages can be accessed publicly, exploitation may affect users who are not authenticated.\u003c/p\u003e\u003cp\u003eThe issue was corrected by applying \u003ccode\u003emarkupsafe.escape()\u003c/code\u003e to each reference tag before inserting it into the HTML badge markup, while retaining \u003ccode\u003eMarkup\u003c/code\u003e only for the static HTML scaffolding.\u003c/p\u003e\u003cbr\u003e"
            }
          ],
          "value": "A stored cross-site scripting (XSS) vulnerability existed in Vulnerability-Lookup in the render_tag_badges Jinja filter used to display reference tags associated with vulnerability records.\n\nValues from containers.cna.references[].tags[] were directly interpolated into HTML badge elements and the resulting string was wrapped in markupsafe.Markup. Because Markup marks the generated content as safe, Jinja\u0027s automatic HTML escaping was bypassed.\n\nAn authenticated user with permissions to create or modify vulnerability records, such as a user holding the vulnerability:create or vulnerability:modify permission, could submit a crafted reference tag through the CNA API containing arbitrary HTML or JavaScript-capable markup.\n\nThe malicious value would subsequently be stored as part of the vulnerability record. When another user visited the corresponding public /cve/\u003cid\u003e or /vuln/\u003cid\u003e page, the crafted tag would be rendered as HTML in the viewer\u0027s browser. This could result in JavaScript execution in the security context of the Vulnerability-Lookup application.\n\nSuccessful exploitation could allow an attacker to perform actions in the context of a victim, access information available to the victim\u0027s browser session, or modify page content. As the affected vulnerability pages can be accessed publicly, exploitation may affect users who are not authenticated.\n\nThe issue was corrected by applying markupsafe.escape() to each reference tag before inserting it into the HTML badge markup, while retaining Markup only for the static HTML scaffolding."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-63",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-63 Cross-Site Scripting (XSS)"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "NONE",
            "userInteraction": "ACTIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:H/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or \u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-12T14:05:39.735Z",
        "orgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
        "shortName": "CIRCL"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/vulnerability-lookup/vulnerability-lookup/commit/d29901655c50cf3c25737d9ea86180268df51b57"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Stored Cross-Site Scripting (XSS) via Unescaped CNA Reference Tags in vulnerability-lookup",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
    "assignerShortName": "CIRCL",
    "cveId": "CVE-2026-73374",
    "datePublished": "2026-08-12T14:05:39.735Z",
    "dateReserved": "2026-08-12T14:05:33.426Z",
    "dateUpdated": "2026-08-12T17:12:36.380Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

FKIE_CVE-2026-73374

CVE-2026-73374 (GCVE-0-2026-73374)

Tags

Sightings

Nomenclature