{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","favicon":"https://feed.craftedsignal.io/favicon-32x32.png","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-27556/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":8.8,"id":"CVE-2026-27556"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":[],"_cs_severities":["high"],"_cs_tags":["CVE-2026-27556","lfi","rce","web-security"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eCVE-2026-27556 describes a critical local file inclusion (LFI) vulnerability within the /index.php/ajax/save_iodd_parameters endpoint. The vulnerability is exploitable by a remote, low-privileged attacker who possesses a valid operator cookie. By manipulating input parameters processed by this endpoint, an attacker can perform LFI, which ultimately facilitates the execution of arbitrary PHP code on the underlying device. This vulnerability presents a significant risk to the integrity and availability of the affected system, as it allows for unauthorized code execution without requiring administrative privileges, provided the attacker has established a low-level authenticated session. Defenders should monitor web server logs for suspicious requests to this specific path, particularly those containing directory traversal patterns or unusual parameters commonly associated with file inclusion attempts.\u003c/p\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-27556 allows an attacker to execute arbitrary code on the affected device, potentially leading to a full system compromise, data exfiltration, or the installation of persistent malicious backdoors. The vulnerability is particularly dangerous because it requires only low-privileged operator access, which is often attainable in many operational environments.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cp\u003eDeploy detection logic to monitor HTTP traffic directed at the vulnerable endpoint. Review access logs for non-standard parameter values or path manipulation signatures. Given the severity of the remote code execution impact, organizations should prioritize identifying and patching affected systems once vendor guidance becomes available.\u003c/p\u003e\n\u003ch2 id=\"rules\"\u003eRules\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003etitle: \u0026quot;Detect CVE-2026-27556 Exploitation - LFI via /index.php/ajax/save_iodd_parameters\u0026quot;\ndescription: \u0026quot;Detects potential exploitation attempts of CVE-2026-27556 by identifying suspicious path manipulation or inclusion characters within the query parameters of the save_iodd_parameters endpoint.\u0026quot;\nlogsource:\ncategory: \u0026quot;webserver\u0026quot;\ndetection:\nselection:\ncs-uri-stem|contains: \u0026quot;/index.php/ajax/save_iodd_parameters\u0026quot;\ncs-uri-query|contains:\u003c/li\u003e\n\u003cli\u003e\u0026quot;../\u0026quot;\u003c/li\u003e\n\u003cli\u003e\u0026quot;..\\\u0026quot;\u003c/li\u003e\n\u003cli\u003e\u0026quot;php://\u0026quot;\u003c/li\u003e\n\u003cli\u003e\u0026quot;file://\u0026quot;\u003c/li\u003e\n\u003cli\u003e\u0026quot;/etc/passwd\u0026quot;\nfilter:\nsc-status|startswith: \u0026quot;4\u0026quot;\ncondition: selection and not filter\nlevel: \u0026quot;high\u0026quot;\ntags:\u003c/li\u003e\n\u003cli\u003e\u0026quot;attack.initial_access\u0026quot;\u003c/li\u003e\n\u003cli\u003e\u0026quot;attack.t1190\u0026quot;\ntests:\npositive:\u003c/li\u003e\n\u003cli\u003ename: \u0026quot;LFI attempt via query parameter\u0026quot;\ndata:\u003c/li\u003e\n\u003cli\u003ecs-uri-stem: \u0026quot;/index.php/ajax/save_iodd_parameters\u0026quot;\ncs-uri-query: \u0026quot;param=../../../../etc/passwd\u0026quot;\nnegative:\u003c/li\u003e\n\u003cli\u003ename: \u0026quot;Legitimate request to endpoint\u0026quot;\ndata:\u003c/li\u003e\n\u003cli\u003ecs-uri-stem: \u0026quot;/index.php/ajax/save_iodd_parameters\u0026quot;\ncs-uri-query: \u0026quot;param=valid_data\u0026quot;\nfalsepositives:\u003c/li\u003e\n\u003cli\u003e\u0026quot;Legitimate API interactions that might include path strings for data validation or processing purposes.\u0026quot;\nhandoff:\ndetection_confidence: \u0026quot;medium\u0026quot;\nrequired_telemetry:\u003c/li\u003e\n\u003cli\u003elog_source: \u0026quot;Web server access logs\u0026quot;\nevent_or_channel: \u0026quot;HTTP requests\u0026quot;\nrequired_fields:\u003c/li\u003e\n\u003cli\u003e\u0026quot;cs-uri-stem\u0026quot;\u003c/li\u003e\n\u003cli\u003e\u0026quot;cs-uri-query\u0026quot;\navailability: \u0026quot;available\u0026quot;\nnotes: \u0026quot;Requires full URI query logging.\u0026quot;\nvalidation:\nstatus: \u0026quot;needs_environment_validation\u0026quot;\nsteps:\u003c/li\u003e\n\u003cli\u003e\u0026quot;Review logs for existing traffic to the identified endpoint to baseline normal activity.\u0026quot;\nexpected_telemetry: \u0026quot;Access logs showing the path /index.php/ajax/save_iodd_parameters.\u0026quot;\npass_criteria: \u0026quot;Detection fires only on anomalous inputs.\u0026quot;\nknown_evasions:\u003c/li\u003e\n\u003cli\u003e\u0026quot;URL encoding and other obfuscation techniques that bypass simple string matching.\u0026quot;\ntuning:\u003c/li\u003e\n\u003cli\u003esource: \u0026quot;Web application traffic\u0026quot;\nguidance: \u0026quot;Refine patterns to match known legitimate input formats if false positives persist.\u0026quot;\nportability_notes:\u003c/li\u003e\n\u003cli\u003eplatform: \u0026quot;Splunk\u0026quot;\nnote: \u0026quot;Map fields to _raw or extracted fields like uri_path and uri_query.\u0026quot;\nsuggested_owner: \u0026quot;Detection Engineering\u0026quot;\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-09-16T09:49:22Z","date_published":"2026-09-16T09:49:22Z","id":"https://feed.craftedsignal.io/briefs/2026-09-cve-2026-27556/","summary":"A local file inclusion vulnerability in the /index.php/ajax/save_iodd_parameters endpoint allows a remote attacker with a valid operator cookie to achieve remote code execution.","title":"Local File Inclusion and RCE in /index.php/ajax/save_iodd_parameters","url":"https://feed.craftedsignal.io/briefs/2026-09-cve-2026-27556/"}],"language":"en","title":"CraftedSignal Threat Feed - CVE-2026-27556","version":"https://jsonfeed.org/version/1.1"}