{"id":"CVE-2025-41086","state":"PUBLISHED","title":"Authorization bypass in GAMS from GAMS Development Corp.","description":"Vulnerability in the access control system of the GAMS licensing system that allows unlimited valid licenses to be generated, bypassing any usage restrictions. The validator uses an insecure checksum algorithm; knowing this algorithm and the format of the license lines, an attacker can recalculate the checksum and generate a valid license to grant themselves full privileges without credentials or access to the source code, allowing them unrestricted access to GAMS's mathematical models and commercial solvers.","publishedAt":"2025-12-02T13:22:23.415Z","updatedAt":"2025-12-02T14:24:21.854Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","source":"INCIBE"},"assigner":"INCIBE","products":["AMS Development Corp. 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