Vulnerability-Lookup

CVE-2026-54162 (GCVE-0-2026-54162)

Vulnerability from cvelistv5 – Published: 2026-10-28 19:44 – Updated: 2026-10-29 18:31

Title

Ember: Unneutralised terminal escape/control sequences from Caddy logs injected into the operator's TUI

Summary

Ember is a real-time terminal dashboard for Caddy servers with FrankenPHP support. Prior to 1.4.2, interactive TUI row formatters pass Caddy access-log fields, particularly the request URI, through the `fitCellLeft` render helper without neutralizing terminal escape or control sequences. An unauthenticated remote client can place ANSI, OSC, or CSI control bytes in an ordinary HTTP request target. Caddy JSON-escapes those bytes, `ParseLogLine` decodes them back into raw controls, and the formatters concatenate them into `View()` output reaching `os.Stdout`. When the operator views the default `Logs` tab, the terminal interprets these sequences, allowing monitoring-dashboard spoofing, clipboard hijacking through `OSC 52`, and window-title spoofing through `OSC 0/2`. This works even with a loopback-only log listener because the input arrives through normal Caddy access logs. `Certificates` and `Routes` share secondary unneutralized render sinks. The `--json`, `--once`, and daemon `--expose` modes are unaffected because they do not render an interactive terminal. Consequences depend on the terminal emulator and usually require further operator action to escalate; this is not general-purpose remote code execution. This issue is fixed in version 1.4.2.

Severity

4.7 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-29 18:31 UTC

CWE

CWE-150 - Improper Neutralization of Escape, Meta, or Control Sequences

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7836 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/alexandre-daubois/ember/securi…	x_refsource_CONFIRM
https://github.com/alexandre-daubois/ember/commit…	x_refsource_MISC
https://github.com/alexandre-daubois/ember/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
alexandre-daubois	ember	Affected: < 1.4.2	guessed

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2026-54162

Vulnerability from fkie_nvd - Published: 2026-10-28 20:18 - Updated: 2026-10-29 19:17

Severity

4.7 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/alexandre-daubois/ember/commit/fcb7160e58dba58d6f9b5033cc312fdedc8c9f6b
	security-advisories@github.com	https://github.com/alexandre-daubois/ember/releases/tag/v1.4.2
	security-advisories@github.com	https://github.com/alexandre-daubois/ember/security/advisories/GHSA-x3g7-qrwc-f6c5

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
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    {
      "affectedData": [
        {
          "product": "ember",
          "vendor": "alexandre-daubois",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.4.2"
            }
          ]
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      ],
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    }
  ],
  "id": "CVE-2026-54162",
  "lastModified": "2026-10-29T19:17:22.213",
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          "baseScore": 4.7,
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          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
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}

GHSA-X3G7-QRWC-F6C5

Vulnerability from github – Published: 2026-08-20 18:36 – Updated: 2026-08-20 18:36

Summary

Ember has unneutralized terminal escape/control sequences from Caddy logs injected into the operator's TUI

Details

Summary

Ember's interactive TUI renders fields taken from the monitored Caddy server's access logs — most notably the request URI — straight to the operator's terminal without neutralising terminal escape or control sequences (CWE-150). Those log fields are populated from arbitrary, unauthenticated HTTP requests, so any remote client can embed ANSI/OSC/CSI control bytes that the operator's terminal emulator interprets when the log row is displayed. The bytes survive the whole pipeline: Caddy escapes them into its JSON access log as unicode escapes, ember's ParseLogLine decodes them back to raw 0x1b/0x07 bytes, and the row formatters concatenate them into the bubbletea View() output with no encoding before they reach os.Stdout.

Impact

An unauthenticated, remote attacker who can send HTTP requests to the Caddy server that ember monitors can inject terminal escape sequences into the operator's TUI. The trigger is a single ordinary HTTP request with control bytes in the request target. It requires no authentication; because the payload is reflected through Caddy's normal access log, it works even when ember's log listener is bound only to loopback. When the operator views the Logs tab — ember's default, zero-config mode — the terminal emulator interprets the injected sequences. Broadly-supported, demonstrated impact includes:

Monitoring-dashboard spoofing — CSI cursor/erase/scroll sequences forge or hide log rows so the operator misjudges the monitored server's state.
Clipboard hijacking (OSC 52) — attacker-chosen text is written into the operator's system clipboard, staging a payload the operator may later paste into a shell.
Window-title spoofing (OSC 0/2) — to support social engineering.

The impact ceiling depends on the operator's terminal emulator and usually requires a further operator action (e.g. a paste) to fully escalate; this is not general-case RCE, though specific terminal emulators have historically escalated escape sequences further. The Certificates and Routes tabs share the same unneutralised render path as secondary sinks. The --json/--once and daemon (--expose) modes are not affected, as they do not render to an interactive terminal.

References

https://github.com/alexandre-daubois/ember/blob/main/internal/ui/logtable.go#L18 — the unneutralised render helper (fitCellLeft) and row formatters (the sink)
https://github.com/alexandre-daubois/ember/blob/main/internal/fetcher/lognetlistener.go — the unauthenticated TCP access-log listener (input source)
https://github.com/alexandre-daubois/ember/blob/main/internal/fetcher/logentry.go — ParseLogLine, where the JSON decode restores raw control bytes
https://cwe.mitre.org/data/definitions/150.html — CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences

Severity

4.7 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/alexandre-daubois/ember"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.4.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54162"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-150"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-20T18:36:01Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nEmber\u0027s interactive TUI renders fields taken from the monitored Caddy server\u0027s access logs \u2014 most notably the request URI \u2014 straight to the operator\u0027s terminal without neutralising terminal escape or control sequences (CWE-150). Those log fields are populated from arbitrary, unauthenticated HTTP requests, so any remote client can embed ANSI/OSC/CSI control bytes that the operator\u0027s terminal emulator interprets when the log row is displayed. The bytes survive the whole pipeline: Caddy escapes them into its JSON access log as unicode escapes, ember\u0027s `ParseLogLine` decodes them back to raw `0x1b`/`0x07` bytes, and the row formatters concatenate them into the bubbletea `View()` output with no encoding before they reach `os.Stdout`.\n\n## Impact\n\nAn **unauthenticated, remote** attacker who can send HTTP requests to the Caddy server that ember monitors can inject terminal escape sequences into the operator\u0027s TUI. The trigger is a single ordinary HTTP request with control bytes in the request target. It requires no authentication; because the payload is reflected through Caddy\u0027s normal access log, it works even when ember\u0027s log listener is bound only to loopback. When the operator views the Logs tab \u2014 ember\u0027s default, zero-config mode \u2014 the terminal emulator interprets the injected sequences. Broadly-supported, demonstrated impact includes:\n\n- **Monitoring-dashboard spoofing** \u2014 CSI cursor/erase/scroll sequences forge or hide log rows so the operator misjudges the monitored server\u0027s state.\n- **Clipboard hijacking (OSC 52)** \u2014 attacker-chosen text is written into the operator\u0027s system clipboard, staging a payload the operator may later paste into a shell.\n- **Window-title spoofing (OSC 0/2)** \u2014 to support social engineering.\n\nThe impact ceiling depends on the operator\u0027s terminal emulator and usually requires a further operator action (e.g. a paste) to fully escalate; this is not general-case RCE, though specific terminal emulators have historically escalated escape sequences further. The Certificates and Routes tabs share the same unneutralised render path as secondary sinks. The `--json`/`--once` and daemon (`--expose`) modes are not affected, as they do not render to an interactive terminal.\n\n## References\n\n- https://github.com/alexandre-daubois/ember/blob/main/internal/ui/logtable.go#L18 \u2014 the unneutralised render helper (`fitCellLeft`) and row formatters (the sink)\n- https://github.com/alexandre-daubois/ember/blob/main/internal/fetcher/lognetlistener.go \u2014 the unauthenticated TCP access-log listener (input source)\n- https://github.com/alexandre-daubois/ember/blob/main/internal/fetcher/logentry.go \u2014 `ParseLogLine`, where the JSON decode restores raw control bytes\n- https://cwe.mitre.org/data/definitions/150.html \u2014 CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences",
  "id": "GHSA-x3g7-qrwc-f6c5",
  "modified": "2026-08-20T18:36:01Z",
  "published": "2026-08-20T18:36:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/alexandre-daubois/ember/security/advisories/GHSA-x3g7-qrwc-f6c5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/alexandre-daubois/ember/commit/fcb7160e58dba58d6f9b5033cc312fdedc8c9f6b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/alexandre-daubois/ember"
    },
    {
      "type": "WEB",
      "url": "https://github.com/alexandre-daubois/ember/releases/tag/v1.4.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Ember has unneutralized terminal escape/control sequences from Caddy logs injected into the operator\u0027s TUI"
}

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-54162 (GCVE-0-2026-54162)

FKIE_CVE-2026-54162

GHSA-X3G7-QRWC-F6C5

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