Unsafe variable evaluation in email templates_CVE-2026-2451

7.5 / 10

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

Description

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.

Basic Information

ID CVE-2026-2451

Source rami.io

Published Feb 16, 2026 at 10:16

Affected Product

Vendor pretix

Product pretix-doistep

Version 1.0.0

Affected Versions pretix pretix-doistep 1.0.0

CWE Classification

CWE-627

References

pretix.eu /about/en/blog/20260216-release-2026-1-1/

{
    "lastseen": "",
    "description": "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's \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.",
    "published": "2026-02-16T10:16:05.423Z",
    "modified": "2026-02-16T10:16:05.423Z",
    "type": "cve",
    "title": "Unsafe variable evaluation in email templates",
    "source": "rami.io",
    "references": "https://pretix.eu/about/en/blog/20260216-release-2026-1-1/",
    "id": "CVE-2026-2451",
    "bulletinFamily": "",
    "cwe": [
        "CWE-627"
    ],
    "cvelist": null,
    "sourceData": "pretix pretix-doistep 1.0.0",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "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"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "pretix-doistep",
    "version": "1.0.0",
    "vendor": "pretix",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}