{"apiVersion":"1.0","identifier":"CVE-2026-72889","description":"Net::OAuth versions before 0.33 for Perl allow the sender to choose the signature algorithm in verify. verify resolves the signature method class from the signature_method parameter of the incoming message. signature_method is required on every request, so the algorithm used to check a signature is chosen by whoever sent it, and nothing lets the verifying party pin the method instead. When a message names HMAC-SHA1 or HMAC-SHA256, the key is derived from consumer_secret and token_secret rather than from the key the provider deployed. A provider deployed on RSA-SHA1 holds only the consumer public key, and RFC 5849 does not use consumer_secret for that method, so the required parameter is filled with a placeholder. A client that names HMAC-SHA1 instead has its signature checked against that placeholder, so a guessable one is enough to forge requests for any consumer key and token.","publishedAt":"2026-08-19T08:17:13","lastModifiedAt":"2026-08-26T19:17:00","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72889","cvssScore":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00347,"riskScore":1.01,"affectedProduct":"Net::OAuth","affectedVersions":"<0.33","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-72889","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-72889","en":"https://www.redsauce.net/en/cves/CVE-2026-72889","fr":"https://www.redsauce.net/fr/cves/CVE-2026-72889","pt":"https://www.redsauce.net/pt/cves/CVE-2026-72889","de":"https://www.redsauce.net/de/cves/CVE-2026-72889","sk":"https://www.redsauce.net/sk/cves/CVE-2026-72889","el":"https://www.redsauce.net/el/cves/CVE-2026-72889"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-72889"}}