Vulnerability-Lookup

GHSA-75MF-97WQ-JJPW

Vulnerability from github – Published: 2026-02-16 12:30 – Updated: 2026-02-16 12:30

Details

It was possible to exfiltrate information about the pretix system through specially crafted placeholder names such as {{event.init.code.co_filename}}. This way, an attacker with the ability to control email templates (usually every user of the pretix backend) could retrieve sensitive information from the system configuration, including even database passwords or API keys. pretix does include mechanisms to prevent the usage of such malicious placeholders, however due to a mistake in the code, they were not fully effective for this plugin.

Out of caution, we recommend that you rotate all passwords and API keys contained in your pretix.cfg file.

Severity ?

7.5 (High)


                  
                    CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/RE:L/U:Red

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-2451"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-627"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-16T11:15:56Z",
    "severity": "HIGH"
  },
  "details": "Emails sent by pretix can utilize placeholders that will be filled with customer data. For example, when {name}\n is used in an email template, it will  be replaced with the buyer\u0027s \nname for the final email. This mechanism contained a security-relevant bug:\n\nIt was possible to exfiltrate information about the pretix system through specially crafted placeholder names such as {{event.__init__.__code__.co_filename}}.\n This way, an attacker with the ability to control email templates \n(usually every user of the pretix backend) could retrieve sensitive \ninformation from the system configuration, including even database \npasswords or API keys. pretix does include mechanisms to prevent the usage of such \nmalicious placeholders, however due to a mistake in the code, they were \nnot fully effective for this plugin.\n\nOut of caution, we recommend that you rotate all passwords and API keys contained in your pretix.cfg\u00a0file.",
  "id": "GHSA-75mf-97wq-jjpw",
  "modified": "2026-02-16T12:30:25Z",
  "published": "2026-02-16T12:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2451"
    },
    {
      "type": "WEB",
      "url": "https://pretix.eu/about/en/blog/20260216-release-2026-1-1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/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:L/U:Red",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-2451 (GCVE-0-2026-2451)

Vulnerability from cvelistv5 – Published: 2026-02-16 10:16 – Updated: 2026-02-17 17:06

Title

Unsafe variable evaluation in email templates

Summary

Emails sent by pretix can utilize placeholders that will be filled with customer data. For example, when {name} is used in an email template, it will be replaced with the buyer's name for the final email. This mechanism contained a security-relevant bug: It was possible to exfiltrate information about the pretix system through specially crafted placeholder names such as {{event.__init__.__code__.co_filename}}. This way, an attacker with the ability to control email templates (usually every user of the pretix backend) could retrieve sensitive information from the system configuration, including even database passwords or API keys. pretix does include mechanisms to prevent the usage of such malicious placeholders, however due to a mistake in the code, they were not fully effective for this plugin. Out of caution, we recommend that you rotate all passwords and API keys contained in your pretix.cfg file.

Severity ?

7.5 (High)


                        
                          CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/RE:L/U:Red

CWE

CWE-627 - Dynamic Variable Evaluation

Assigner

rami.io

References

URL

Tags

https://pretix.eu/about/en/blog/20260216-release-…

vendor-advisory

Impacted products

	Vendor	Product	Version
	pretix	pretix-doistep	Affected: 1.0.0 , < 1.3.2 (python)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-2451",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-17T16:43:11.539670Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-17T17:06:30.536Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://marketplace.pretix.eu/",
          "defaultStatus": "unaffected",
          "packageName": "pretix-doistep",
          "product": "pretix-doistep",
          "vendor": "pretix",
          "versions": [
            {
              "lessThan": "1.3.2",
              "status": "affected",
              "version": "1.0.0",
              "versionType": "python"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eEmails sent by pretix can utilize placeholders that will be filled with customer data. For example, when \u003ccode\u003e{name}\u003c/code\u003e\n is used in an email template, it will  be replaced with the buyer\u0027s \nname for the final email. This mechanism contained a security-relevant bug:\u003c/p\u003e\u003cp\u003eIt was possible to exfiltrate information about the pretix system through specially crafted placeholder names such as \u003ccode\u003e{{event.__init__.__code__.co_filename}}\u003c/code\u003e.\n This way, an attacker with the ability to control email templates \n(usually every user of the pretix backend) could retrieve sensitive \ninformation from the system configuration, including even database \npasswords or API keys. pretix does include mechanisms to prevent the usage of such \nmalicious placeholders, however due to a mistake in the code, they were \nnot fully effective for this plugin.\u003c/p\u003e\u003cp\u003eOut of caution, we recommend that you rotate all passwords and API keys contained in your pretix.cfg\u0026nbsp;file.\u003cbr\u003e\u003c/p\u003e"
            }
          ],
          "value": "Emails sent by pretix can utilize placeholders that will be filled with customer data. For example, when {name}\n is used in an email template, it will  be replaced with the buyer\u0027s \nname for the final email. This mechanism contained a security-relevant bug:\n\nIt was possible to exfiltrate information about the pretix system through specially crafted placeholder names such as {{event.__init__.__code__.co_filename}}.\n This way, an attacker with the ability to control email templates \n(usually every user of the pretix backend) could retrieve sensitive \ninformation from the system configuration, including even database \npasswords or API keys. pretix does include mechanisms to prevent the usage of such \nmalicious placeholders, however due to a mistake in the code, they were \nnot fully effective for this plugin.\n\nOut of caution, we recommend that you rotate all passwords and API keys contained in your pretix.cfg\u00a0file."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-545",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-545 Pull Data from System Resources"
            }
          ]
        },
        {
          "capecId": "CAPEC-77",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-77 Manipulating User-Controlled Variables"
            }
          ]
        },
        {
          "capecId": "CAPEC-54",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-54 Query System for Information"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "HIGH",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "exploitMaturity": "PROOF_OF_CONCEPT",
            "privilegesRequired": "LOW",
            "providerUrgency": "RED",
            "subAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/RE:L/U:Red",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "LOW"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-627",
              "description": "CWE-627 Dynamic Variable Evaluation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-16T10:16:05.423Z",
        "orgId": "655498c3-6ec5-4f0b-aea6-853b334d05a6",
        "shortName": "rami.io"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://pretix.eu/about/en/blog/20260216-release-2026-1-1/"
        }
      ],
      "source": {
        "discovery": "INTERNAL"
      },
      "title": "Unsafe variable evaluation in email templates",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Limit backend access to trusted users, do not use user-controlled variables in the email templates."
            }
          ],
          "value": "Limit backend access to trusted users, do not use user-controlled variables in the email templates."
        }
      ],
      "x_generator": {
        "engine": "Vulnogram 0.5.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "655498c3-6ec5-4f0b-aea6-853b334d05a6",
    "assignerShortName": "rami.io",
    "cveId": "CVE-2026-2451",
    "datePublished": "2026-02-16T10:16:05.423Z",
    "dateReserved": "2026-02-13T09:57:34.221Z",
    "dateUpdated": "2026-02-17T17:06:30.536Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-75MF-97WQ-JJPW

CVE-2026-2451 (GCVE-0-2026-2451)

Tags

Sightings

Nomenclature