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CVE-2026-13603— SSRF with API key leak in pretix-oppwa

Quick assessment

Affected
pretix pretix-oppwa
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

pretix-oppwa是德国pretix公司的一款用于支付处理的集成插件。 pretix pretix-oppwa 1.4.4之前版本存在安全漏洞，该漏洞源于未正确验证URL中的resourcePath参数，导致攻击者可通过注入恶意参数将请求指向其他服务器，从而泄露访问令牌。

AI Predicted 8.1 Difficulty: Easy EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1105 · Ingress Tool Transfer

Affected Version Matrix 1

VendorProduct Version RangeStatus
pretix pretix-oppwa < 1.4.4 affected
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I. Basic Information for CVE-2026-13603

Vulnerability Information
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Vulnerability Title
SSRF with API key leak in pretix-oppwa
Source: CVE Program / CVE List V5
Vulnerability Description
The payment integration pretix-oppwa provides support for the payment providers VR Payment, Hobex, and potentially others based on Oppwa's technology. The integration of Oppwa, following their official documentation, includes a step where the user is redirected from the payment provider back to our system with a query parameter like ?resourcePath=/v1/checkouts/{checkoutId}/payment in the URL. Our system is then supposed to fetch the status of the transaction from the URL given by baseUrl + resourcePath. Our plugin pretix-oppwa did so insecurely by concatenating the parameter form the URL to the base domain of the API without further validation and, critically, without a / at the end of the baseUrl. Therefore, an attacker could inject a resourcePath argument in a way that causes pretix to call a different server instead. Since the request includes the access token (API key) of the Oppwa account, this would leak the access token, giving access to data contained in the payment provider's system. This is fixed with the release today by strictly validating the given API URL. After installing the update, we recommend asking your payment provider for a new access token and updating it in pretix.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
pretix pretix-oppwa 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
pretix-oppwa是德国pretix公司的一款用于支付处理的集成插件。 pretix pretix-oppwa 1.4.4之前版本存在安全漏洞，该漏洞源于未正确验证URL中的resourcePath参数，导致攻击者可通过注入恶意参数将请求指向其他服务器，从而泄露访问令牌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pretix pretix-oppwa 0 ~ 1.4.4 -

II. Public POCs for CVE-2026-13603

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III. Intelligence Information for CVE-2026-13603

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Security Blog Posts for CVE-2026-13603 (1)

IV. Related Vulnerabilities

Same product: pretix-oppwa
Same vendor: pretix
Same weakness: CWE-20

V. Comments for CVE-2026-13603

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