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### Summary The wrong string if check is run for `iss` checking, resulting in `"acb"` being accepted for `"_abc_"`. ### Details This is a bug introduced in version [2.10.0](https://github.com/jpadilla/pyjwt/commit/1570e708672aa9036bc772476beae8bfa48f4131#diff-6893ad4a1c5a36b8af3028db8c8bc3b62418149843fc382faf901eaab008e380R366): checking the "iss" claim changed from `isinstance(issuer, list)` to `isinstance(issuer, Sequence)`. ```diff - if isinstance(issuer, list): + if isinstance(issuer, Sequence): if payload["iss"] not in issuer: raise InvalidIssuerError("Invalid issuer") else: ``` Since str is a Sequnce, but not a list, `in` is also used for string comparison. This results in `if "abc" not in "__abcd__":` being checked instead of `if "abc" != "__abc__":`. ### PoC Check out the unit tests added here: https://github.com/jpadilla/pyjwt-ghsa-75c5-xw7c-p5pm ```python issuer = "urn:expected" payload = {"iss": "urn:"} ...
ABB Cylon Aspect version 3.08.00 suffers from a vulnerability in the fileSystemUpdate.php endpoint of the ABB BEMS controller due to improper handling of uploaded files. The endpoint lacks restrictions on file size and type, allowing attackers to upload excessively large or malicious files. This flaw could be exploited to cause denial of service (DoS) attacks, memory leaks, or buffer overflows, potentially leading to system crashes or further compromise.
ABB Cylon Aspect version 3.08.01 suffers from an unauthenticated information disclosure vulnerability. An unauthorized attacker can reference the affected page and disclose various BACnet MS/TP statistics running on the device.
ABB Cylon Aspect version 3.08.01 suffers from an unauthenticated information disclosure vulnerability. An unauthorized attacker can reference the affected page and disclose various protocol thread information running on the device.
AppleAVD has an issue where a large OBU size in AV1_Syntax::Parse_Header reading can lead to out-of-bounds reads.
AppleAVD has an issue in AV1_Syntax::f leading to out-of-bounds reads.
AppleAVD has an integer underflow in AV1_Syntax::Parse_Header that can lead to out-of-bounds reads.
Debian Linux Security Advisory 5822-1 - It was discovered that in SimpleSAMLphp, an implementation of the SAML 2.0 protocol, is prone to a XXE vulnerability when loading an (untrusted) XML document.
Debian Linux Security Advisory 5821-1 - Multiple security issues were discovered in Thunderbird, which could result in denial of service or the execution of arbitrary code.
Debian Linux Security Advisory 5820-1 - Multiple security issues have been found in the Mozilla Firefox web browser, which could potentially result in the execution of arbitrary code, spoofing or cross-site scripting.