Vulnerability-Lookup

GHSA-PG4W-4Q6C-JVPM

Vulnerability from github – Published: 2026-10-30 18:32 – Updated: 2026-10-30 18:32

Details

RTIR extends RT's HTML scrubber to allow an internal link placeholder, and the extension lets through any link that merely contains the placeholder, including links using the executable javascript: scheme. The change applies to the whole RT instance once RTIR is installed, not only to RTIR's own queues. Anyone who can add HTML content to a ticket on such an instance can store such a link. That includes an unauthenticated sender of HTML email to the Incident Reports queue, which RTIR opens to everyone by default. Script runs when a user clicks the link, in that user's session, and can act in RT with that user's authority.

This issue was fixed in version 5.0.11 and 6.0.4

Severity

5.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-105456"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-30T16:17:37Z",
    "severity": "MODERATE"
  },
  "details": "RTIR extends RT\u0027s HTML scrubber to allow an internal link\n      placeholder, and the extension lets through any link that merely\n      contains the placeholder, including links using the executable\n      javascript: scheme. The change applies to the whole RT instance\n      once RTIR is installed, not only to RTIR\u0027s own queues. Anyone who\n      can add HTML content to a ticket on such an instance can store\n      such a link. That includes an unauthenticated sender of HTML email\n      to the Incident Reports queue, which RTIR opens to everyone by\n      default. Script runs when a user clicks the link, in that user\u0027s\n      session, and can act in RT with that user\u0027s authority.\n\n\nThis issue was fixed in version\u00a05.0.11 and 6.0.4",
  "id": "GHSA-pg4w-4q6c-jvpm",
  "modified": "2026-10-30T18:32:37Z",
  "published": "2026-10-30T18:32:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-105456"
    },
    {
      "type": "WEB",
      "url": "https://cert.pl/en/posts/2026/10/CVE-2026-105454"
    },
    {
      "type": "WEB",
      "url": "https://requesttracker.com/rtir"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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"
    }
  ]
}

CVE-2026-105456 (GCVE-0-2026-105456)

Vulnerability from cvelistv5 – Published: 2026-10-30 15:22 – Updated: 2026-10-30 17:18 X_Open Source

Title

Stored XSS via HTML scrubber rule in RTIR

Summary

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-30 17:05 UTC

CWE

CWE-79 - Improper neutralization of input during web page generation ('cross-site scripting')

Assigner

CERT-PL CNA under the ENISA root

CNA scorecard B 81/100 over 256 records in the last 180 days details

References

2 references

URL	Tags
https://cert.pl/en/posts/2026/10/CVE-2026-105454	third-party-advisory
https://requesttracker.com/rtir/	product

Impacted products

1 product

Vendor	Product	Version
Best Practical Solutions	RT for Incident Response	Affected: 5.0.0 , < 5.0.11 (semver) Affected: 6.0.0 , < 6.0.4 (semver) cpe:2.3:a:best_practical_solutions:rt_for_incident_response:::::::: cpe:2.3:a:best_practical_solutions:rt_for_incident_response::::::::

Credits

Mateusz Szymaniec (CERT.PL)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-105456",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-30T17:05:31.942517Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-30T17:18:22.375Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "RT for Incident Response",
          "repo": "https://github.com/bestpractical/rtir",
          "vendor": "Best Practical Solutions",
          "versions": [
            {
              "lessThan": "5.0.11",
              "status": "affected",
              "version": "5.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "6.0.4",
              "status": "affected",
              "version": "6.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:best_practical_solutions:rt_for_incident_response:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.0.11",
                  "versionStartIncluding": "5.0.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:best_practical_solutions:rt_for_incident_response:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.4",
                  "versionStartIncluding": "6.0.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ],
          "operator": "OR"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Mateusz Szymaniec (CERT.PL)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "RTIR extends RT\u0027s HTML scrubber to allow an internal link\n      placeholder, and the extension lets through any link that merely\n      contains the placeholder, including links using the executable\n      javascript: scheme. The change applies to the whole RT instance\n      once RTIR is installed, not only to RTIR\u0027s own queues. Anyone who\n      can add HTML content to a ticket on such an instance can store\n      such a link. That includes an unauthenticated sender of HTML email\n      to the Incident Reports queue, which RTIR opens to everyone by\n      default. Script runs when a user clicks the link, in that user\u0027s\n      session, and can act in RT with that user\u0027s authority.\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003eThis issue was fixed in version\u0026nbsp;5.0.11 and 6.0.4\u003c/div\u003e"
            }
          ],
          "value": "RTIR extends RT\u0027s HTML scrubber to allow an internal link\n      placeholder, and the extension lets through any link that merely\n      contains the placeholder, including links using the executable\n      javascript: scheme. The change applies to the whole RT instance\n      once RTIR is installed, not only to RTIR\u0027s own queues. Anyone who\n      can add HTML content to a ticket on such an instance can store\n      such a link. That includes an unauthenticated sender of HTML email\n      to the Incident Reports queue, which RTIR opens to everyone by\n      default. Script runs when a user clicks the link, in that user\u0027s\n      session, and can act in RT with that user\u0027s authority.\n\n\nThis issue was fixed in version\u00a05.0.11 and 6.0.4"
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-592",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-592 Stored XSS"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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 (\u0027cross-site scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T15:22:07.644Z",
        "orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
        "shortName": "CERT-PL"
      },
      "references": [
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://cert.pl/en/posts/2026/10/CVE-2026-105454"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://requesttracker.com/rtir/"
        }
      ],
      "source": {
        "discovery": "INTERNAL"
      },
      "tags": [
        "x_open-source"
      ],
      "title": "Stored XSS via HTML scrubber rule in RTIR",
      "x_generator": {
        "engine": "Vulnogram 1.0.3"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
    "assignerShortName": "CERT-PL",
    "cveId": "CVE-2026-105456",
    "datePublished": "2026-10-30T15:22:07.644Z",
    "dateReserved": "2026-10-05T14:00:11.458Z",
    "dateUpdated": "2026-10-30T17:18:22.375Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

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.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted