wetty provides terminal access in browser over http/https. Prior to version 3.0.4, the wetty client decodes a base64 filename from the file-download escape sequence and interpolates it raw into a Toastify HTML string (`escapeMarkup: false`). Any output the victim renders - a `cat`'d file, a tailed log, an SSH MOTD, a `curl` response - that contains `\x1b[5i...:...\x1b[4i` runs script in the wetty origin and types attacker-chosen keystrokes into the victim's SSH session. Version 3.0.4 fixes the issue.
Metrics
Affected Vendors & Products
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References
History
Thu, 13 Aug 2026 19:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | wetty provides terminal access in browser over http/https. Prior to version 3.0.4, the wetty client decodes a base64 filename from the file-download escape sequence and interpolates it raw into a Toastify HTML string (`escapeMarkup: false`). Any output the victim renders - a `cat`'d file, a tailed log, an SSH MOTD, a `curl` response - that contains `\x1b[5i...:...\x1b[4i` runs script in the wetty origin and types attacker-chosen keystrokes into the victim's SSH session. Version 3.0.4 fixes the issue. | |
| Title | wetty vulnerable to DOM XSS via file-download filename | |
| Weaknesses | CWE-79 | |
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cvssV4_0
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-08-13T19:10:41.037Z
Reserved: 2026-06-01T22:03:19.640Z
Link: CVE-2026-49864
Vulnrichment
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NVD
Status : Received
Published: 2026-08-13T20:17:22.720
Modified: 2026-08-13T20:17:22.720
Link: CVE-2026-49864
Redhat
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OpenCVE Enrichment
Updated: 2026-08-13T21:00:06Z