{"basis":"claimed","id":"CVE-2026-35616","name":"Fortinet FortiClient EMS Improper Access Control Vulnerability","vendorProject":"Fortinet","product":"FortiClient EMS","publishedAt":"2026-04-04","cvss":{"score":9.1,"severity":"CRITICAL","version":"3.1"},"exploited":{"kevAdded":"2026-04-06","dueDate":"2026-04-09","ransomware":false},"epss":{"score":0.93983,"percentile":0.99846,"date":"2026-11-02"},"coverage":{"cloudflare":{"status":"none","firstOn":null,"daysToRule":null},"aws":{"status":"none","firstOn":null,"daysToRule":null},"azure":{"status":"none","firstOn":null,"daysToRule":null},"google":{"status":"none","firstOn":null,"daysToRule":null},"fastly":{"status":"no_history","firstOn":null,"daysToRule":null},"f5":{"status":"rule","firstOn":"2026-07-07","daysToRule":94},"akamai":{"status":"no_source","firstOn":null,"daysToRule":null},"crs":{"status":"none","firstOn":null,"daysToRule":null}},"title":null,"description":"A improper access control vulnerability in Fortinet FortiClientEMS 7.4.5 through 7.4.6 may allow an unauthenticated attacker to execute unauthorized code or commands via crafted requests.","cwes":["CWE-284"],"vendors":[{"vendor":"cloudflare","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"aws","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"azure","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"google","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"fastly","status":"no_history","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"f5","status":"rule","basis":"claimed","firstOn":"2026-07-07","firstIsNew":true,"daysToRule":94,"daysAtMost":null,"freePlan":false,"claims":[{"id":"03b46217ea4fba750a60ae89eabc98797a26142aafe5b839a8f0ee7a01576810","cve_id":"CVE-2026-35616","vendor":"f5","product":"Attack signatures","rule_id":"200013188","rule_name":"Fortinet FortiClientEMS Authentication Bypass","change":"new","default_action":null,"published_on":"2026-07-07","source_url":"https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog","source_title":"F5 Distributed Cloud attack signatures changelog","excerpt":"Added: signature 200013188 \"Fortinet FortiClientEMS Authentication Bypass\" (Authentication/Authorization Attacks, risk High), systems: Other Web Server. References: CVE-2026-35616.","first_seen_at":"2026-11-02T21:00:24.693Z"}]},{"vendor":"akamai","status":"no_source","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"crs","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]}],"updatedAt":"2026-11-04T04:17:38.285Z","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C","ssvc":{"exploitation":"active","automatable":"yes","technicalImpact":"total"},"kevAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","kevNotes":"Please adhere to Fortinet's guidelines to assess exposure and mitigate risks. Check for signs of potential compromise on all internet accessible Fortinet products affected by this vulnerability. Apply any final mitigations provided by the vendor as soon as they become available. For more information please see: https://fortiguard.fortinet.com/psirt/FG-IR-26-099 ; https://nvd.nist.gov/vuln/detail/CVE-2026-35616","references":[{"url":"https://fortiguard.fortinet.com/psirt/FG-IR-26-099","name":null,"tags":[]}],"affected":[{"vendor":"Fortinet","product":"FortiClientEMS","affected":["7.4.5 through 7.4.6"],"fixed":[]}],"briefing":{"status":{"id":"known_exploited","label":"Known exploited"},"why":"CISA lists CVE-2026-35616 as exploited in the wild since 2026-04-06. It is reachable over the network without credentials or any user interaction (CVSS 9.1). A public scanner template probes for it. In our benchmark, 0 of 6 WAF configurations stopped every variant of the public exploit.","who":"Teams running Fortinet FortiClientEMS (7.4.5 through 7.4.6). Prioritise internet-facing instances.","what_to_do":[{"text":"Apply the vendor's fix; the advisory lists the affected and fixed versions.","href":"https://fortiguard.fortinet.com/psirt/FG-IR-26-099","linkText":"fortiguard.fortinet.com"},{"text":"CISA's required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. US federal agencies must act by 2026-04-09."},{"text":"Review exposed instances for signs of compromise: it was exploited before many systems were patched, and a later patch does not undo access already gained."},{"text":"Keep a WAF rule in place while you patch: F5 ships a rule you may need to switch on. A WAF rule reduces exposure; it does not replace the patch.","href":"#edge","linkText":"Edge coverage"},{"text":"Check which WAF sits in front of your site and whether it covers this CVE.","href":"#check","linkText":"Check your domain"}],"evidence":[{"heading":"CVE record","text":"CVSS 3.1 9.1 (critical). Weakness: CWE-284.","links":[{"label":"CVE-2026-35616","href":"https://www.cve.org/CVERecord?id=CVE-2026-35616"},{"label":"NVD","href":"https://nvd.nist.gov/vuln/detail/CVE-2026-35616"}]},{"heading":"Vendor advisory","text":"Fixes and mitigations the CVE record links to. Check affected builds against the vendor, including backports.","links":[{"label":"fortiguard.fortinet.com","href":"https://fortiguard.fortinet.com/psirt/FG-IR-26-099"}]},{"heading":"Exploit evidence","text":"A nuclei template exists, which our lab and benchmark replay.","links":[]},{"heading":"Seen exploited","text":"Claimed in 7 Telegram posts (unverified).","links":[]},{"heading":"CISA KEV","text":"Added 2026-04-06, federal due date 2026-04-09 (catalog 2026.11.03, checked 2026-11-04).","links":[{"label":"CISA KEV catalog","href":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-35616"}]},{"heading":"EPSS","text":"94.0% probability of exploitation activity in the next 30 days, higher than 99% of CVEs (2026-11-02).","links":[{"label":"FIRST EPSS","href":"https://api.first.org/data/v1/epss?cve=CVE-2026-35616"}]},{"heading":"WAF vendor statements","text":"F5 names it in a changelog. Quotes and dates below.","links":[{"label":"Vendor statements","href":"#evidence"}]},{"heading":"Measured","text":"0 of 6 WAF configurations stopped every variant of the public exploit in our daily benchmark.","links":[{"label":"WAF benchmark","href":"/bench"}]}],"agent_prompt":"Assess whether the infrastructure available to you is affected by CVE-2026-35616 (Fortinet FortiClient EMS Improper Access Control Vulnerability). Perform a read-only assessment within your authorized access. Do not send exploit traffic, scan third-party systems, change configuration or restart services.\n\n1. Verify the CVE record at https://www.cve.org/CVERecord?id=CVE-2026-35616 and the vendor advisory. Establish affected and fixed versions, including vendor backports. The record lists: Fortinet FortiClientEMS: affected 7.4.5 through 7.4.6. Cite sources and retrieval dates; flag anything you cannot verify.\n2. Inventory deployments of Fortinet FortiClient EMS: asset, environment, owner where known, installed version or build, and how you confirmed it (package metadata, a version endpoint, image tags). An image tag alone does not prove the running version.\n3. Identify which deployments are reachable from the internet or untrusted networks, and through which paths (direct origin, load balancer, CDN or WAF).\n4. Assess compensating controls separately from patch status. Current edge WAF coverage for this CVE: F5: rule exists, check whether it is enabled. Live data: https://cve.vigilbase.com/api/v1/cves/CVE-2026-35616. Check whether the rule is enabled and in block mode on each path, and whether any path bypasses the WAF. A WAF rule is not a patch.\n5. It is known exploited (CISA KEV): review logs on exposed instances for signs of exploitation before and after patching.\n\nReturn a short summary and a table: asset | version/build | assessment (affected, fixed, not applicable, unknown) | exposure | compensating control | evidence | next action. List what you could not assess and the access needed to resolve it. Do not infer absence of compromise from patch status or a lack of alerts.\n\nRemediation guidance: Apply the vendor's fix; the advisory lists the affected and fixed versions. CISA's required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. US federal agencies must act by 2026-04-09.\nMore: https://cve.vigilbase.com/cve/CVE-2026-35616"},"measured":[{"engineId":"owasp-crs","engineName":"OWASP Core Rule Set","engineVersion":"4.25.0","runtime":"Coraza v3.8.1","config":"paranoia level 1, anomaly threshold 5, default CRS settings","ranAt":"2026-11-02T13:02:57.000Z","verdict":"blocked","templateId":"CVE-2026-35616","templatePath":"http/cves/2026/CVE-2026-35616.yaml","requests":2,"blockedRequests":2,"rules":["920340","920640"],"note":"","requestDetail":[{"method":"POST","path":"/api/v1/fabric_device_auth/fortigate/init","status":403,"blocked":true,"rules":["920340","920640"]},{"method":"POST","path":"/api/v1/fabric_device_auth/fortigate/init","status":403,"blocked":true,"rules":["920340","920640"]}]},{"engineId":"owasp-crs","engineName":"OWASP Core Rule Set","engineVersion":"4.25.0","runtime":"Coraza v3.8.1","config":"paranoia level 2, anomaly threshold 5, default CRS settings","ranAt":"2026-11-02T13:03:28.000Z","verdict":"blocked","templateId":"CVE-2026-35616","templatePath":"http/cves/2026/CVE-2026-35616.yaml","requests":2,"blockedRequests":2,"rules":["920340","920640"],"note":"","requestDetail":[{"method":"POST","path":"/api/v1/fabric_device_auth/fortigate/init","status":403,"blocked":true,"rules":["920340","920640"]},{"method":"POST","path":"/api/v1/fabric_device_auth/fortigate/init","status":403,"blocked":true,"rules":["920340","920640"]}]}],"sightings":{"honeypot":null,"catalog":null,"reports":[],"telegram":{"posts":7,"last":"2026-09-19"},"days":{"honeypot":[],"reports":[],"telegram":["2026-08-19","2026-08-23","2026-08-31","2026-09-19"]}},"social":{"total":0,"first_seen":null,"daily":[{"day":"2026-10-22","posts":0},{"day":"2026-10-23","posts":0},{"day":"2026-10-24","posts":0},{"day":"2026-10-25","posts":0},{"day":"2026-10-26","posts":0},{"day":"2026-10-27","posts":0},{"day":"2026-10-28","posts":0},{"day":"2026-10-29","posts":0},{"day":"2026-10-30","posts":0},{"day":"2026-10-31","posts":0},{"day":"2026-11-01","posts":0},{"day":"2026-11-02","posts":0},{"day":"2026-11-03","posts":0},{"day":"2026-11-04","posts":0}],"top_posts":[],"exploit_repositories":[]}}