CVE-2026-15409
CVE-2026-15409 is a security flaw in SonicWall SMA1000 Appliances, SonicWall’s firewall and remote-access equipment. Attackers can make SonicWall SMA1000 Appliances send requests into the network behind it from anywhere, without logging in. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 14 Jul 2026, and says ransomware gangs have used it.[1]
SonicWall SMA1000 Appliances is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. SonicWall has published a fix or advice.
Description
CISA calls it a server-side request forgery in SonicWall SMA1000 Appliances. In its words: “SonicWall SMA1000 Appliances contain a server-side request forgery vulnerability that could allow a remote unauthenticated attacker to potentially cause the appliance to make requests to unintended location.”[1]
The underlying weakness is server-side request forgery (CWE-918), in MITRE’s list of common software weaknesses.[2]
It scores 10.0 out of 10 on the Common Vulnerability Scoring System, which rates it critical, scored by the organisation that published the CVE using CVSS 3.1.[2]
Affected versions
NVD’s record doesn’t list version ranges for it; SonicWall’s advisory has them[3]. CISA names the product as SonicWall SMA1000 Appliances.
Most families won’t have SonicWall SMA1000 Appliances; it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 14 Jul 2026, within a day of it being made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 17 Jul 2026 to fix it.[1] CISA says ransomware gangs have used it.
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 7%. That’s in the top 7% of the flaws it scores.[4]
CISA assesses it as automatable: attackers can run it against many targets at once.
CISA doesn’t say who was attacked, or how.
Fix
SonicWall has published a fix or advice.[3] CISA’s required action: “Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes).”[1]
- Check whether you use it.SonicWall SMA1000 Appliances is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
- Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 17 Jul 2026 to fix it.
- If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.
You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 10.0.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks, noting that ransomware gangs have used it.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 7%.[4] |
See also
Other SonicWall SMA1000 Appliances flaws
- CVE-2026-83549: OS command injection ·
- CVE-2026-83548: server-side request forgery ·
- CVE-2026-15410: code injection ·
- CVE-2025-23006: deserialization ·
Other SonicWall flaws
- CVE-2025-40602, SonicWall SMA1000 appliance: sMA1000 missing authorization ·
- CVE-2023-44221, SonicWall SMA100 Appliances: OS command injection ·
- CVE-2021-20035, SonicWall SMA100 Appliances: OS command injection ·
- CVE-2024-53704, SonicWall SonicOS: SSLVPN improper authentication ·
- CVE-2024-40766, SonicWall SonicOS: improper access control ·
Other server-side request forgery flaws
- CVE-2026-96655, Plex Media Server: server-side request forgery (SSRF) ·
- CVE-2026-96652, Plex Media Server: server-side request forgery (SSRF) ·
- CVE-2026-64849, MLflow: server-side request forgery ·
- CVE-2026-20230, Cisco Unified Communications Manager: server-side request forgery (SSRF) ·
- CVE-2021-22054, Omnissa Workspace One UEM: workspace ONE server-side request forgery ·
Added the same day
- CVE-2026-56164, Microsoft SharePoint Server: missing authentication for critical function ·
- CVE-2026-56155, Microsoft Active Directory Federation Services: insufficient granularity of access control ·
- CVE-2026-15410, SonicWall SMA1000 Appliances: code injection ·
Every SonicWall flaw on CISA’s list · Everything added in July 2026
References
- ^ Cybersecurity and Infrastructure Security Agency. “SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability”. Known Exploited Vulnerabilities Catalog, added 14 Jul 2026.
- ^ National Institute of Standards and Technology. “CVE-2026-15409 Detail”. National Vulnerability Database, published 14 Jul 2026.
- ^ SonicWall. Advisories and fixes: psirt.global.sonicwall.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.068, percentile 94.0, 31 Oct 2026.
- CVE Program. “CVE-2026-15409”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.