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Full vulnerability report · 2026
CVE-2026-1731High confidence

BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA) OS Command Injection Vulnerability

BeyondTrust · Remote Support (RS) and Privileged Remote Access (PRA)

9.9CriticalCVSS 4.0
Recommended action
Mitigate now

CISA confirms exploitation in the wild and lists 2026-02-16 as the remediation due date.

Mitigation available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityCriticalOperational priority:Critical, unchanged from published severity.unchanged

Evidence used

  • CISA confirms exploitation in the wild.
  • A structured source references public exploit or proof-of-concept material.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 90.89% for the current model date.

Compensating controls

  • Apply the linked authoritative mitigation while planning the permanent fix.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA) and falls inside the recorded affected range.
  2. Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-5559

EU known exploited

BeyondTrust Remote Support (RS) and certain older versions of Privileged Remote Access (PRA) contain a critical pre-authentication remote code execution vulnerability. By sending specially crafted requests, an unauthenticated remote attacker may be able to execute operating system commands in the context of the site user.

EUVD state
Present in the current official mapping
Known exploitation
Recorded by ENISA since 13 Feb 2026. Evidence sources: cisa_kev, eukev_kev.
ENISA score
9.9 · CVSS 4.0
Advisory evidence
2 linked advisory records
Explicit mitigation evidence

Only statements that explicitly mention a fix, patch, update, workaround or mitigation are shown here.

  • csaf_ncscnl · NCSC-2026-0048Kwetsbaarheid verholpen in BeyondTrust Remote Support
Recommended actionMitigate now

CISA confirms exploitation in the wild and lists 2026-02-16 as the remediation due date.

Mitigation available
01

What, why and how

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.

What

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.

Why

Untrusted input is incorporated into an operating-system command without safe parameter handling.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

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.

Why

Untrusted input is incorporated into an operating-system command without safe parameter handling.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Confirmed in the wild

CISA added this CVE to its Known Exploited Vulnerabilities catalogue on 2026-02-13. Known ransomware campaign use is recorded.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Not a CVSS 4.0 base metric
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-78 ↗

CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:H/SA:L

Common Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATNoneAttack requirements: No additional deployment or execution condition is required.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.VCHighVulnerable-system confidentiality: A successful attack can cause a major loss.VIHighVulnerable-system integrity: A successful attack can cause a major loss.VAHighVulnerable-system availability: A successful attack can cause a major loss.SCLowSubsequent-system confidentiality: A successful attack can cause a limited loss.SIHighSubsequent-system integrity: A successful attack can cause a major loss.SALowSubsequent-system availability: A successful attack can cause a limited loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-78CISA KEVPublic exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-5559Known-exploited evidence recorded

BeyondTrust Remote Support (RS) and certain older versions of Privileged Remote Access (PRA) contain a critical pre-authentication remote code execution vulnerability. By sending specially crafted requests, an unauthenticated remote attacker may be able to execute operating system commands in the context of the site user.

Official EUVD record ↗
BSI · German · WID-SEC-2026-0331BeyondTrust Privileged Remote Access und Remote Support: Schwachstelle ermöglicht Codeausführung

Ein Angreifer kann eine Schwachstelle in BeyondTrust Privileged Remote Access und BeyondTrust Remote Support ausnutzen, um Code auszuführen.

Official advisory ↗
Canadian Centre for Cyber Security · English · AL26-003AL26-003 - Vulnerability affecting BeyondTrust - CVE-2026-1731

An Alert is used to raise awareness of a recently identified cyber threat that may impact cyber information assets, and to provide additional detection and mitigation advice to recipients. The Canadian Centre for Cyber Security ("Cyber Centre") is also available to provide additional assistance regarding the content of this Alert to recipients as requested.

Official advisory ↗
Canadian Centre for Cyber Security · English · AV26-097BeyondTrust security advisory (AV26-097) - Update 2

On February 6, 2026, BeyondTrust published security advisory to address a vulnerability in the following products: Open-source reporting indicates that CVE-2026-1731 vulnerability is being exploited.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260211Security Bulletin 11 Feb 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 11 Feb 2026, published on 11 February 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-004047BeyondTrust Corporationのprivileged remote access等の複数製品におけるOS コマンドインジェクションの脆弱性

BeyondTrust Remote Support (RS) および特定の古いバージョンの Privileged Remote Access (PRA) には、重要な事前認証リモートコード実行の脆弱性が存在します。特別に細工されたリクエストを送信することで、認証されていないリモート攻撃者がサイトユーザーのコンテキストでオペレーティングシステムのコマンドを実行できる可能性があります。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6696BeyondTrust 제품 보안 업데이트 권고

o BeyondTrust에서 발생하는 원격 코드 실행(RCE) 취약점 [1][2]

Official advisory ↗
NCSC-NL · Dutch · NCSC-2026-0048Kwetsbaarheid verholpen in BeyondTrust Remote Support

De kwetsbaarheid bevindt zich in de pre-authenticatie van de software, waardoor niet-geauthenticeerde aanvallers in staat zijn om besturingssysteemcommando's uit te voeren door speciaal vervaardigde verzoeken naar de getroffen systemen te sturen. **Update 13 02 2026:** Voor de kwetsbaarheid CVE-2026-1731 is recentelijk publieke proof-of-concept code verschenen en ook actief misbruik waargenomen. Deze factoren verhogen aanzienlijk het risico op misbruik.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Mitigation available
Affected
Remote Support(RS) & Privileged Remote Access(PRA): ≤ RS 25.3.1, ≤ PRA 24.3.4
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
The Cyber Centre recommends that organizations upgrade affected BeyondTrust instances to a fixed version: Affected product Affected versions Fixed version Remote Support 25.3.1 and prior Patch BT26-02-RS (v21.3 - 25.3.1) Remote Support 25.3.1 and prior 25.3.2 and greater Privileged Remote Access 24.3.4 and prior Patch BT26-02-PRA (v22.1 - 24.X) Privileged Remote Access 24.3.4 and prior 25.1 and greater BeyondTrust has confirmed that a patch has been applied to all Remote Support SaaS and Privileged Remote Access SaaS customers as of February 2, 2026 that remediates this vulnerability. For the self-hosted instances of Remote Support and Privileged Remote Access, organizations should apply the patch manually if their instance is not subscribed to automatic updates. The Cyber Centre also recommends that organizations review their logs to detect anomalies and unauthorized access. If immediate patching is not possible, reduce exposure by: Restrict management interfaces via firewall or IP allowlists Remove externally exposed instances from Internet until patch is applied In addition, the Cyber Centre strongly recommends that organizations review and implement the Cyber Centre's Top 10 IT Security Actions with an emphasis on the following topics Footnote 6 . Patch operating systems and applications Harden operating systems and applications Isolate web-facing applications Should activity matching the content of this alert be discovered, recipients are encouraged to report via My Cyber Portal , or email contact@cyber.gc.ca .
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 6 Feb 2026 · Last source change 26 Feb 2026, 15:04 UTC · CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-5559
Product sourceCISA KEV
Remediation sourceCVE/CNA references
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. BlackTree coverageBlackTree article coverage changed from no BlackTree article to 1 BlackTree article.
    Before
    no BlackTree article
    After
    1 BlackTree article
    BlackTree editorial ↗
  2. Vendor guidanceAuthoritative vendor guidance changed: removed remediation: cyber.gc.ca/al26-003-vulnerability-affecting-beyondtrust-cve-2026-1731.
    Before
    remediation: cyber.gc.ca/al26-003-vulnerability-affecting-beyondtrust-cve-2026-1731 · vendor advisory: beyondtrust.com/bt26-02
    After
    vendor advisory: beyondtrust.com/bt26-02
    beyondtrust.com ↗
  3. Remediation statusRemediation status changed from Mitigation available to Awaiting fix.
    Before
    Mitigation available
    After
    Awaiting fix
    beyondtrust.com ↗
  4. Affected versionsThe structured affected or fixed version information changed.
    Before
    ≤ RS 25.3.1; ≤ PRA 24.3.4 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    Remote Support(RS) & Privileged Remote Access(PRA): ≤ RS 25.3.1, ≤ PRA 24.3.4 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  5. Remediation statusRemediation status changed from Awaiting fix to Mitigation available.
    Before
    Awaiting fix
    After
    Mitigation available
    Canadian Centre for Cyber Security ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Added to CISA KEV
Remediation guidance recorded
ENISA EUVD · EUVD-2026-5559↗Canadian Centre for Cyber Security remediation guidance↗CISA KEV record↗Vendor advisory↗CVE authority or vendor reference↗Public exploit reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-1731 · cve.blacktree.nl