Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-v5ff-xmfp-p245
Advisory ID github_osv/GHSA-v5ff-xmfp-p245
Aliases CVE-2026-49255
Summary electerm has Command Injection in File System Operations (rmrf, mv, cp) ### Impact A command injection vulnerability exists in electerm's file system operations (`rmrf`, `mv`, `cp`) in `src/app/lib/fs.js`. These functions construct shell commands by interpolating file paths directly into command strings without escaping shell metacharacters. **Vulnerable functions:** - `rmrf()` - Uses `rm -rf "${path}"` (double quotes, vulnerable to `"` injection) - `mv()` - Uses `mv '${from}' '${to}'` (single quotes, vulnerable to `'` injection) - `cp()` - Uses `cp -r "${from}" "${to}"` (double quotes, vulnerable to `"` injection) **Attack scenario:** 1. Attacker controls a malicious SSH/SFTP server 2. Server lists files with shell metacharacters in names (e.g., `file"$(touch /tmp/pwned)"`) 3. Victim connects to the server and performs file operations (remote-to-local transfer, rename on conflict, etc.) 4. The malicious filename is passed to `rmrf()`, `mv()`, or `cp()` without sanitization 5. Shell metacharacters break out of the quoted argument and execute arbitrary commands **Impact includes:** - Arbitrary command execution as the electerm desktop user - Data exfiltration, malware installation, or system compromise - Both POSIX (bash) and Windows (PowerShell) platforms are affected ### Patches - https://github.com/electerm/electerm/commit/aa778818843b9c083bd711cd04644d102fcb5a42 ### Workarounds If upgrading is not immediately possible, users can mitigate this vulnerability by: 1. Only connecting to trusted SSH/SFTP servers 2. Avoiding remote-to-local file transfers from untrusted sources 3. Not using the "rename on conflict" option when downloading folders from untrusted servers 4. Manually verifying filenames before performing file operations
Status Published
Exploitability 0.5
Weighted Severity 7.9
Risk 4.0
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
System Score Found at
cvssv3.1 8.8 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-v5ff-xmfp-p245/GHSA-v5ff-xmfp-p245.json
generic_textual HIGH
Reference id Reference type URL
https://github.com/electerm/electerm
https://github.com/electerm/electerm/commit/aa778818843b9c083bd711cd04644d102fcb5a42
https://github.com/electerm/electerm/security/advisories/GHSA-v5ff-xmfp-p245
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-v5ff-xmfp-p245/GHSA-v5ff-xmfp-p245.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-08-25T02:03:51Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/49xxx/CVE-2026-49255.json

Source Advisory: vulnrichment/CVE-2026-49255

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'total'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]