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CVE-2026-1731

From Exploited flaws, HARD’s guide to the flaws being used in attacks · Checked
This article is about a flaw in BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA). For every flaw being used in attacks, see Exploited flaws; for BeyondTrust’s, see BeyondTrust flaws being used in attacks.

CVE-2026-1731 is a security flaw in BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA), remote-support software IT providers use to manage their customers’ computers. Attackers can run their own code on BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA) 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 13 Feb 2026, and says ransomware gangs have used it.[1]

BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA) 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. BeyondTrust has published a fix or advice.

Description

CISA calls it an OS command injection in BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA). In its words: “BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA)contain an OS command injection vulnerability. Successful exploitation could allow an unauthenticated remote attacker to execute operating system commands in the context of the site user. Successful exploitation requires no authentication or user interaction and may lead to system compromise, including unauthorized access, data exfiltration, and service disruption.”[1]

The underlying weakness is OS command injection (CWE-78), in MITRE’s list of common software weaknesses.[2]

It scores 9.8 out of 10 on the Common Vulnerability Scoring System, which rates it critical, scored by NVD using CVSS 3.1.[2]

Affected versions

NVD’s record doesn’t list version ranges for it; BeyondTrust’s advisory has them[3]. CISA names the product as BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA).

Most families won’t have BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA); it’s for whoever looks after IT at work.

Exploitation

CISA added it to its catalog of known exploited vulnerabilities on 13 Feb 2026, 7 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 16 Feb 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 93%. That’s in the top 1% 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

BeyondTrust has published a fix or advice.[3] 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.”[1]

  1. Check whether you use it.BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA) 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 16 Feb 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 9.8.[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 93%.[4]

See also

Other BeyondTrust flaws

  • CVE-2026-102764, BeyondTrust Remote Support: authentication bypass by spoofing ·
  • CVE-2024-12686, BeyondTrust Privileged Remote Access (PRA) and Remote Support (RS): OS command injection ·
  • CVE-2024-12356, BeyondTrust Privileged Remote Access (PRA) and Remote Support (RS): command injection ·

Other OS command injection flaws

  • CVE-2026-110447, Collabora Online – Built-in CODE Server: online – built-in CODE server OS command injection ·
  • CVE-2026-106931, EG Secure Solutions SiteGuard Server Edition: OS command injection ·
  • CVE-2026-83549, SonicWall SMA1000 Appliances: OS command injection ·
  • CVE-2026-49869, Kestra OSS: OSS OS command injection ·
  • CVE-2026-73570, Synacor Zimbra Collaboration Suite (ZCS): OS command injection ·

Every BeyondTrust flaw on CISA’s list · Everything added in February 2026

References

  1. ^ Cybersecurity and Infrastructure Security Agency. “BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA) OS Command Injection Vulnerability”. Known Exploited Vulnerabilities Catalog, added 13 Feb 2026.
  2. ^ National Institute of Standards and Technology. “CVE-2026-1731 Detail”. National Vulnerability Database, published 6 Feb 2026.
  3. ^ BeyondTrust. Advisories and fixes: beyondtrust.com.
  4. ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.931, percentile 99.8, 31 Oct 2026.
  5. CVE Program. “CVE-2026-1731”. 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.