{"id":"CVE-2026-17532","aliases":["EUVD-2026-53175","GHSA-ff83-hfr5-72ch"],"status":"published","title":"Seraphinite Accelerator \u003c= 2.29.18 - Reflected Cross-Site Scripting","description":"The Seraphinite Accelerator plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'seraph_accel_prep' parameter in versions up to, and including, 2.29.15. This is due to the CacheExtractPreparePageParams() function using PHP's loose inequality operator (!=) to compare the expected HMAC string against the JSON-decoded 'nonce' value — supplying the JSON boolean true causes any non-empty HMAC string to compare as loosely equal, bypassing the signature check — combined with insufficient output escaping in the _CbContentFinishSkip() function, which concatenates the attacker-controlled 'selfTest' field directly into the HTML response body. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a specially crafted link.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00794,"percentile":0.56696,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-79"],"published":"2026-08-05T06:37:56Z","modified":"2026-08-12T21:00:37Z","exploits":[{"source":"nuclei","id":"CVE-2026-17532","title":"Seraphinite Accelerator \u003c= 2.29.18 - Cross-Site Scripting","type":"detection template","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-17532.yaml"},{"source":"pocgithub","id":"kalhoralireza/CVE-2026-17532","title":"kalhoralireza/CVE-2026-17532","date":"2026-08-05","url":"https://github.com/kalhoralireza/CVE-2026-17532"},{"source":"pocgithub","id":"kalhoralireza/CVE-2026-17532-lab","title":"kalhoralireza/CVE-2026-17532-lab","date":"2026-08-25","url":"https://github.com/kalhoralireza/CVE-2026-17532-lab"}],"products":[{"vendor":"seraphinitesoft","product":"seraphinite accelerator"}],"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/5aeea62b-bd6c-4fe2-8c0f-8c9919688e87?source=cve"},{"url":"https://plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.18/cache_ex.php#L838"},{"url":"https://plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.18/common.php#L6036"},{"url":"https://plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.18/cache.php#L76"},{"url":"https://plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.15/cache_ex.php#L838"},{"url":"https://plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.15/common.php#L6036"},{"url":"https://plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.15/cache.php#L76"},{"url":"https://plugins.trac.wordpress.org/changeset?sfp_email=\u0026sfph_mail=\u0026reponame=\u0026new=3624461%40seraphinite-accelerator%2Ftrunk%2Fcommon.php\u0026old=3619618%40seraphinite-accelerator%2Ftrunk%2Fcommon.php\u0026sfp_email=\u0026sfph_mail="},{"url":"https://plugins.trac.wordpress.org/changeset?sfp_email=\u0026sfph_mail=\u0026reponame=\u0026new=3624461%40seraphinite-accelerator%2Ftrunk%2Fcache_ex.php\u0026old=3619618%40seraphinite-accelerator%2Ftrunk%2Fcache_ex.php\u0026sfp_email=\u0026sfph_mail="},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-17532"},{"url":"https://github.com/advisories/GHSA-ff83-hfr5-72ch"}],"sources":{"cve":[{"id":"CVE-2026-17532","title":"Seraphinite Accelerator \u003c= 2.29.18 - Reflected Cross-Site Scripting","description":"The Seraphinite Accelerator plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'seraph_accel_prep' parameter in versions up to, and including, 2.29.15. This is due to the CacheExtractPreparePageParams() function using PHP's loose inequality operator (!=) to compare the expected HMAC string against the JSON-decoded 'nonce' value — supplying the JSON boolean true causes any non-empty HMAC string to compare as loosely equal, bypassing the signature check — combined with insufficient output escaping in the _CbContentFinishSkip() function, which concatenates the attacker-controlled 'selfTest' field directly into the HTML response body. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a specially crafted link.","status":"published","published":"2026-08-05T06:37:56.029Z","modified":"2026-08-05T14:15:11.427Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:19:54.84674Z"}],"euvd":[{"id":"EUVD-2026-53175","description":"The Seraphinite Accelerator plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'seraph_accel_prep' parameter in versions up to, and including, 2.29.15. This is due to the CacheExtractPreparePageParams() function using PHP's loose inequality operator (!=) to compare the expected HMAC string against the JSON-decoded 'nonce' value — supplying the JSON boolean true causes any non-empty HMAC string to compare as loosely equal, bypassing the signature check — combined with insufficient output escaping in the _CbContentFinishSkip() function, which concatenates the attacker-controlled 'selfTest' field directly into the HTML response body. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a specially crafted link.","status":"published","published":"2026-08-05T06:37:56Z","modified":"2026-08-05T14:15:11Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T18:02:10.319044Z"}],"ghsa":[{"id":"GHSA-ff83-hfr5-72ch","title":"The Seraphinite Accelerator plugin for WordPress is vulnerable to Reflected Cross-Site Scripting...","description":"The Seraphinite Accelerator plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'seraph_accel_prep' parameter in versions up to, and including, 2.29.15. This is due to the CacheExtractPreparePageParams() function using PHP's loose inequality operator (!=) to compare the expected HMAC string against the JSON-decoded 'nonce' value — supplying the JSON boolean true causes any non-empty HMAC string to compare as loosely equal, bypassing the signature check — combined with insufficient output escaping in the _CbContentFinishSkip() function, which concatenates the attacker-controlled 'selfTest' field directly into the HTML response body. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a specially crafted link.","status":"published","published":"2026-08-05T09:31:16Z","modified":"2026-08-05T09:31:26Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:10:06.632203Z"}],"nvd":[{"id":"CVE-2026-17532","description":"The Seraphinite Accelerator plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'seraph_accel_prep' parameter in versions up to, and including, 2.29.15. This is due to the CacheExtractPreparePageParams() function using PHP's loose inequality operator (!=) to compare the expected HMAC string against the JSON-decoded 'nonce' value — supplying the JSON boolean true causes any non-empty HMAC string to compare as loosely equal, bypassing the signature check — combined with insufficient output escaping in the _CbContentFinishSkip() function, which concatenates the attacker-controlled 'selfTest' field directly into the HTML response body. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a specially crafted link.","status":"published","published":"2026-08-05T08:16:32.123Z","modified":"2026-08-12T21:00:37.147Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:35.031043Z"}]}}