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CVE-2026-84869

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

CVE-2026-84869 is a security flaw in ConnectWise ScreenConnect, remote-support software IT providers use to manage their customers’ computers. Attackers can reach parts of ConnectWise ScreenConnect that should be locked to them. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 11 Sep 2026.[1]

ConnectWise ScreenConnect 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. ConnectWise has published a fix or advice.

Description

CISA calls it an improper privilege management and missing authorization in ConnectWise ScreenConnect. In its words: “ConnectWise ScreenConnect contains both an improper privilege management and missing authorization vulnerability that may allow an attacker to transfer and execute files through an active remote session without authorization or host confirmation.”[1]

The underlying weakness is improper privilege management (CWE-269), missing authorization (CWE-862), in MITRE’s list of common software weaknesses.[2]

It scores 9.9 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; ConnectWise’s advisory has them[3]. CISA names the product as ConnectWise ScreenConnect.

Most families won’t have ConnectWise ScreenConnect; it’s for whoever looks after IT at work.

Exploitation

CISA added it to its catalog of known exploited vulnerabilities on 11 Sep 2026, 3 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 14 Sep 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 40% 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

ConnectWise 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.ConnectWise ScreenConnect 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 14 Sep 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 9.9.[2]
CISA adds it to its catalog of flaws known to be used in attacks.[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 under 1%.[4]

See also

Other ConnectWise ScreenConnect flaws

Other improper privilege management flaws

  • CVE-2026-102490, Zammad GmbH Zammad: improper privilege management ·
  • CVE-2026-46817, Oracle E-Business Suite: improper privilege management ·
  • CVE-2026-21533, Microsoft Windows: improper privilege management ·
  • CVE-2024-8068, Citrix Session Recording: improper privilege management ·
  • CVE-2024-49035, Microsoft Partner Center: improper access control ·

Added the same day

  • CVE-2026-85706, GitLab Community Edition and Enterprise Edition: path traversal ·
  • CVE-2026-42018, JFrog Artifactory: improper authentication ·
  • CVE-2026-42016, JFrog Artifactory: incorrect authorization ·

Every ConnectWise flaw on CISA’s list · Everything added in September 2026

References

  1. ^ Cybersecurity and Infrastructure Security Agency. “ConnectWise ScreenConnect Improper Privilege Management and Missing Authorization Vulnerability”. Known Exploited Vulnerabilities Catalog, added 11 Sep 2026.
  2. ^ National Institute of Standards and Technology. “CVE-2026-84869 Detail”. National Vulnerability Database, published 8 Sep 2026.
  3. ^ ConnectWise. Advisories and fixes: connectwise.com, connectwise.com.
  4. ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.009, percentile 60.4, 31 Oct 2026.
  5. CVE Program. “CVE-2026-84869”. 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.