NewsCompaniesFlawsGuides
Get the app

CVE-2026-19868

From Exploited flaws, HARD’s guide to the flaws being used in attacks · Checked
This article is about a flaw in SonicWall SonicOS SSLVPN. For every flaw being used in attacks, see Exploited flaws; for SonicWall’s, see SonicWall flaws being used in attacks.

CVE-2026-19868 is a security flaw in SonicWall SonicOS SSLVPN, SonicWall’s firewall and remote-access equipment. Attackers are using a flaw in SonicWall SonicOS SSLVPN. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 6 Nov 2026.[1]

SonicWall SonicOS SSLVPN 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 an use of single-factor authentication in SonicWall SonicOS SSLVPN. In its words: “SonicWall SonicOS SSLVPN contains a use of single-factor authentication vulnerability that may allow a user with valid credentials for an alternate authentication method to bypass SAML authentication controls. Successful exploitation may also bypass SAML-enforced multi-factor authentication (MFA).”[1]

The underlying weakness is CWE-308, in MITRE’s list of common software weaknesses.[2]

It scores 7.5 out of 10 on the Common Vulnerability Scoring System, which rates it high, 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 SonicOS SSLVPN.

Most families won’t have SonicWall SonicOS SSLVPN; it’s for whoever looks after IT at work.

Exploitation

CISA added it to its catalog of known exploited vulnerabilities on 6 Nov 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 20 Nov 2026 to fix it.[1]

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 under 1%. That’s in the top 50% of the flaws it scores.[4]

CISA assesses it as not automatable: each attack takes some work.

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]

  1. Check whether you use it.SonicWall SonicOS SSLVPN 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.
  2. Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 20 Nov 2026 to fix it.
  3. 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

DateEvent
The flaw is made public in the National Vulnerability Database, with a severity score of 7.5.[2]
CISA adds it to its catalog of flaws known to be used in attacks.[1]
FIRST puts the odds of it being used in attacks in the next 30 days at under 1%.[4]
CISA’s deadline for US government agencies to fix it.[1]

See also

In the news

Other SonicWall flaws

  • CVE-2026-83549, SonicWall SMA1000 Appliances: OS command injection ·
  • CVE-2026-83548, SonicWall SMA1000 Appliances: server-side request forgery ·
  • CVE-2026-15410, SonicWall SMA1000 Appliances: code injection ·
  • CVE-2026-15409, SonicWall SMA1000 Appliances: server-side request forgery ·
  • CVE-2025-40602, SonicWall SMA1000 appliance: sMA1000 missing authorization ·

Every SonicWall flaw on CISA’s list · Everything added in November 2026

References

  1. ^ Cybersecurity and Infrastructure Security Agency. “SonicWall SonicOS SSLVPN Use of Single-factor Authentication Vulnerability”. Known Exploited Vulnerabilities Catalog, added 6 Nov 2026.
  2. ^ National Institute of Standards and Technology. “CVE-2026-19868 Detail”. National Vulnerability Database, published 6 Nov 2026.
  3. ^ SonicWall. Advisories and fixes: psirt.global.sonicwall.com.
  4. ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.006, percentile 50.0, 7 Nov 2026.
  5. CVE Program. “CVE-2026-19868”. The official CVE record.

This article is built from CISA’s catalog (version 2026.11.06), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.