Pre-authentication command execution via Bash arithmetic evaluation
Published Feb 6, 2026 · Updated Feb 6, 2026
OS command injection in BeyondTrust Remote Support 25.3.1 and earlier and PRA 24.3.4 and earlier allows remote attackers to execute commands. The WebSocket-reachable thin-scc-wrapper script evaluates the attacker-controlled remoteVersion value as a Bash arithmetic expression, so embedded command substitution runs before its numeric comparison. No authentication or user interaction is required; commands run as the site user and expose appliance configuration, managed sessions, and network traffic.
Summary
What happened
OS command injection in BeyondTrust Remote Support 25.3.1 and earlier and PRA 24.3.4 and earlier allows remote attackers to execute commands. The WebSocket-reachable thin-scc-wrapper script evaluates the attacker-controlled remoteVersion value as a Bash arithmetic expression, so embedded command substitution runs before its numeric comparison. No authentication or user interaction is required; commands run as the site user and expose appliance configuration, managed sessions, and network traffic.
The record
- CVE
- CVE-2026-1731
- Published
- Feb 6, 2026
- Updated
- Feb 6, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-78, CAPEC-248, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 6, 2026CVE publishedPublication date reported by the CVE source.
- Feb 6, 2026Record updatedLatest update available in the CVE record.
- Feb 10, 2026Exploitation reportedBeyondTrust-observed active exploitation attempts
- Feb 13, 2026Exploitation reportedCISA Known Exploited Vulnerabilities catalog entry
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- win3zz CVE-2026-1731 pre-authentication RCE proof of conceptproof of concept · unverified
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- Unit 42 observed post-exploitation campaignthreat actor
- CISA Known Exploited Vulnerabilities catalog entryknown exploited catalog
- BeyondTrust-observed active exploitation attemptsreported exploitation
Technologies
Your stack
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Your stack
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