https://cve.radiocsirt.org Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Fri, 09 Oct 2026 21:04:15 +0000 https://cve.radiocsirt.org/vuln/cve-2026-52767 <p><strong>Affected:</strong> yeswiki</p> <p>YesWiki is a wiki system written in PHP. From version 4.6.2 to before version 4.6.6, HttpSignatureService::verifySignature() checks the result of PHP&#39;s openssl_verify() with a loose boolean negation - if (!openssl_verify(...)) { throw ... }. PHP&#39;s openssl_verify has four possible return values: 1, 0, -1, and &#34;false&#34;. The -1 row is the bypass: PHP&#39;s truthiness rules make -1 a truthy value, so !(-1) === false, the throw is skipped, and the controller proceeds to processActivity(). Any condition that makes OpenSSL&#39;s EVP_VerifyFinal() return -1 triggers the bypass. The reachable consequence is the controller silently treats a failed verification as success and processes the attacker&#39;s payload. This issue has been patched in version 4.6.6.</p> <p><strong>Affected:</strong> yeswiki</p> <p>YesWiki is a wiki system written in PHP. From version 4.6.2 to before version 4.6.6, HttpSignatureService::verifySignature() checks the result of PHP&#39;s openssl_verify() with a loose boolean negation - if (!openssl_verify(...)) { throw ... }. PHP&#39;s openssl_verify has four possible return values: 1, 0, -1, and &#34;false&#34;. The -1 row is the bypass: PHP&#39;s truthiness rules make -1 a truthy value, so !(-1) === false, the throw is skipped, and the controller proceeds to processActivity(). Any condition that makes OpenSSL&#39;s EVP_VerifyFinal() return -1 triggers the bypass. The reachable consequence is the controller silently treats a failed verification as success and processes the attacker&#39;s payload. This issue has been patched in version 4.6.6.</p> https://cve.radiocsirt.org/vuln/cve-2026-52767