Security readout for executives and security teams
Plain-English summary
A flaw in Termix before version 2.3.2 can let a user with tunnel-editing access execute arbitrary commands on a connected SSH host when a tunnel disconnects. Commands run with the connected SSH account’s privileges, potentially exposing data, disrupting services, or enabling further compromise.
Executive priority
Prioritize an expedited upgrade wherever Termix manages sensitive or production SSH hosts. The potential impact is full command execution under connected accounts, although exploitation requires specific tunnel-management access according to the advisory narrative. Investigate recent tunnel changes and disconnections while remediation proceeds.
Technical view
The tunnel disconnect route constructs single-quoted process-matching patterns using editable tunnel fields. A single quote in a host field can break the intended quoting and introduce a shell command. The command executes during tunnel teardown on the source SSH host. This is CWE-78 command injection and is fixed in Termix 2.3.2.
Likely exposure
Deployments running Termix versions earlier than 2.3.2 are potentially affected when users can authenticate, edit tunnel host fields, and disconnect tunnels tied to SSH connections. Impact depends on the privileges and reach of the connected SSH account. The supplied sources provide no CPEs or deployment-prevalence data.
Exploitation context
The supplied advisory describes a remotely reachable, low-complexity path, but its narrative requires an authenticated user able to edit tunnel settings. No CISA KEV listing or cited evidence of active exploitation is provided. Treat exploitation status as unconfirmed rather than active.
Researcher notes
The supplied CVSS vector is 9.8 with PR:N, while the vulnerability description says exploitation requires an authenticated user with tunnel-editing capability. This discrepancy should be considered during local risk scoring. The vulnerable behavior is identified in src/backend/ssh/tunnel.ts; the cited pull request and commit document the correction.
Mitigation direction
- Upgrade Termix to version 2.3.2 or later.
- Restrict tunnel configuration and disconnection permissions until upgrades are complete.
- Review connected SSH accounts and reduce their privileges where practical.
- Check the vendor advisory and release notes for additional guidance.
Validation and detection
- Inventory Termix deployments and confirm their installed versions.
- Identify users permitted to edit tunnel host fields or disconnect tunnels.
- Review tunnel configurations for unexpected single quotes or suspicious field changes.
- Examine Termix and SSH-host logs for unusual activity around tunnel disconnections.
- Confirm upgraded systems report version 2.3.2 or later.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-53545 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9GitHub_MVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/Termix-SSH/Termix/security/advisories/GHSA-5p86-jgr7-4hwxCVE reference, GitHub_M · x_refsource_CONFIRM
- https://github.com/Termix-SSH/Termix/pull/874CVE reference, GitHub_M · x_refsource_MISC
- https://github.com/Termix-SSH/Termix/commit/52f4e51ae03b5b8d2608e1383e2ccf79d290132bCVE reference, GitHub_M · x_refsource_MISC
- https://github.com/Termix-SSH/Termix/releases/tag/release-2.3.2-tagCVE reference, GitHub_M · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in an OS Command
Improper Neutralization of Special Elements used in an OS Command represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.