Vulnerability-Lookup

GHSA-RHV9-26QC-872F

Vulnerability from github – Published: 2026-09-29 03:30 – Updated: 2026-09-30 12:35

Details

GestSup versions before 3.2.62 contain a stored cross-site scripting vulnerability in the IMAP OAuth connector that double-decodes MIME-encoded email subjects after HTML escaping. Unauthenticated attackers can send crafted emails to monitored mailboxes with nested MIME encoded-words to inject JavaScript that executes in technician sessions when viewing tickets.

Severity

6.1 (Medium)


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

5.3 (Medium)


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

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-102374"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-29T01:16:44Z",
    "severity": "MODERATE"
  },
  "details": "GestSup versions before 3.2.62 contain a stored cross-site scripting vulnerability in the IMAP OAuth connector that double-decodes MIME-encoded email subjects after HTML escaping. Unauthenticated attackers can send crafted emails to monitored mailboxes with nested MIME encoded-words to inject JavaScript that executes in technician sessions when viewing tickets.",
  "id": "GHSA-rhv9-26qc-872f",
  "modified": "2026-09-30T12:35:14Z",
  "published": "2026-09-29T03:30:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-102374"
    },
    {
      "type": "WEB",
      "url": "https://blog.spiizn.xyz/articles/remote-code-execution-turning-a-ticket-into-a-new-issue"
    },
    {
      "type": "WEB",
      "url": "https://gestsup.fr/index.php?page=changelog"
    },
    {
      "type": "WEB",
      "url": "https://gestsup.fr/index.php?page=download"
    },
    {
      "type": "WEB",
      "url": "https://gestsup.fr/index.php?page=download\u0026channel=stable\u0026version=3.2.62\u0026type=patch"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/gestsup-before-3.2.62-stored-xss-via-double-decoded-email-subject-in-oauth-imap-connector"
    }
  ],
  "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"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/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-2026-102374 (GCVE-0-2026-102374)

Vulnerability from cvelistv5 – Published: 2026-09-29 00:33 – Updated: 2026-09-30 11:15

Title

GestSup before 3.2.62 Stored XSS via Double-Decoded Email Subject in OAuth IMAP Connector

Summary

Severity

5.3 (Medium)


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

6.1 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-29 10:46 UTC

CWE

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

Assigner

VulnCheck mitre root Scorecard

References

5 references

URL	Tags
https://gestsup.fr/index.php?page=changelog	release-notes
https://gestsup.fr/index.php?page=download	product
https://gestsup.fr/index.php?page=download&channe…	patch
https://www.vulncheck.com/advisories/gestsup-befo…	third-party-advisory
https://blog.spiizn.xyz/articles/remote-code-exec…	technical-descriptionexploit

Impacted products

1 product

Vendor	Product	Version
GestSup	GestSup	Affected: 0 , < 3.2.62 (semver) cpe:2.3:a:gestsup:gestsup::::::::

Date Public

2026-08-24 00:00

Credits

SpiizN

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-102374",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-29T10:46:09.147752Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-29T10:46:53.656Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "GestSup",
          "vendor": "GestSup",
          "versions": [
            {
              "lessThan": "3.2.62",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:gestsup:gestsup:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "3.2.62",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "SpiizN"
        }
      ],
      "datePublic": "2026-08-24T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "GestSup versions before 3.2.62 contain a stored cross-site scripting vulnerability in the IMAP OAuth connector that double-decodes MIME-encoded email subjects after HTML escaping. Unauthenticated attackers can send crafted emails to monitored mailboxes with nested MIME encoded-words to inject JavaScript that executes in technician sessions when viewing tickets."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "PASSIVE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
            "version": "3.1"
          },
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      "problemTypes": [
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          "descriptions": [
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              "cweId": "CWE-79",
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              "lang": "en",
              "type": "CWE"
            }
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      "providerMetadata": {
        "dateUpdated": "2026-09-30T11:15:14.390Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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      "references": [
        {
          "tags": [
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          ],
          "url": "https://gestsup.fr/index.php?page=changelog"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://gestsup.fr/index.php?page=download"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://gestsup.fr/index.php?page=download\u0026channel=stable\u0026version=3.2.62\u0026type=patch"
        },
        {
          "name": "VulnCheck Advisory: GestSup before 3.2.62 Stored XSS via Double-Decoded Email Subject in OAuth IMAP Connector",
          "tags": [
            "third-party-advisory"
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          "url": "https://www.vulncheck.com/advisories/gestsup-before-3.2.62-stored-xss-via-double-decoded-email-subject-in-oauth-imap-connector"
        },
        {
          "tags": [
            "technical-description",
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          "url": "https://blog.spiizn.xyz/articles/remote-code-execution-turning-a-ticket-into-a-new-issue/"
        }
      ],
      "title": "GestSup before 3.2.62 Stored XSS via Double-Decoded Email Subject in OAuth IMAP Connector",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-102374",
    "datePublished": "2026-09-29T00:33:24.255Z",
    "dateReserved": "2026-09-28T23:57:27.220Z",
    "dateUpdated": "2026-09-30T11:15:14.390Z",
    "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.

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.
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GHSA-RHV9-26QC-872F

CVE-2026-102374 (GCVE-0-2026-102374)

Tags

Sightings

Nomenclature

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