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PYSEC-2026-1817
No affected components available
Summary
Open redirect vulnerability due to incorrect validation of input values when redirecting users after login.
Details
pyload is validating URLs via the get_redirect_url function when redirecting users at login.
The URL entered in the next variable goes through the is_safe_url function, where a lack of validation can redirect the user to an arbitrary domain.
The documentation in the urllib library shows that improper URLs are recognized as relative paths when using the urlparse function. (https://docs.python.org/3/library/urllib.parse.html#urllib.parse.urlparse)
For example, When an unusual URL like https:///example.com is entered, urlparse interprets it as a relative path, but in the actual request it is converted to https://example.com due to url normalization.
PoC
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In the next variable, insert the URL to which you want to redirect the user.
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Check that it is possible to bypass url validation and redirect users to an arbitrary url.
Impact
An attacker can use this vulnerability to redirect users to malicious websites, which can be used for phishing and similar attacks.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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