CVE-2026-12862Network attack vector

Formula execution via unescaped attendee fields

Published Jun 22, 2026 · Updated Jun 22, 2026

Formula injection in Venueless before 0a35457f allows remote authenticated users to execute formulas through administrator XLSX exports. The generate_attendee_list task appends untrusted attendee fields to an openpyxl workbook, which interprets equals-prefixed strings as formulas instead of text. Low-privileged access is required to supply the data, and an administrator must generate and open the workbook; effects are confined to workbook integrity and the spreadsheet user's environment.

CVSS severity5.1
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Formula injection in Venueless before 0a35457f allows remote authenticated users to execute formulas through administrator XLSX exports. The generate_attendee_list task appends untrusted attendee fields to an openpyxl workbook, which interprets equals-prefixed strings as formulas instead of text. Low-privileged access is required to supply the data, and an administrator must generate and open the workbook; effects are confined to workbook integrity and the spreadsheet user's environment.

The record

CVE
CVE-2026-12862
Published
Jun 22, 2026
Updated
Jun 22, 2026
Vendor
pretix GmbH
Product
Venueless
Classifications
CWE-148, CAPEC-23, T1204.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.0.0 <0a35457f

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

pretix GmbH · Venuelessversion=0.0.0 <0a35457f

Published CVSS scores

5.1rami.ioCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-148Improper Neutralization of Input Leaders
CAPEC-23File Content Injection
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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