CVE-2026-61891

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Source
https://cve.org/CVERecord?id=CVE-2026-61891
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61891.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-61891
Aliases
  • GHSA-qqc8-9538-25v4
Published
2026-08-05T11:03:01.669Z
Modified
2026-08-09T03:47:25.317251870Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
[none]
Details

In Eclipse Theia versions up to and including 1.73.1, the @theia/filesystem backend exposes HTTP file-download endpoints (GET /file, GET /files/, PUT /files/) that convert a client-supplied URI directly to a filesystem path and stream the file, without confining it to the workspace or any allow-listed root. In browser (non-Electron) deployments the connection token is enforced only on WebSocket upgrades; the HTTP middleware in @theia/core re-issues the cookie and calls next() without rejecting tokenless HTTP requests, so these endpoints are reachable without a valid token. As a result an unauthenticated client can read any file readable by the backend process, including files outside the opened workspace (for example /etc/hosts, SSH keys, or tokens). Electron mode uses a separate ElectronSecurityToken and is not affected via this path.

Database specific 
{
    "cwe_ids": [
        "CWE-200",
        "CWE-22",
        "CWE-306",
        "CWE-36"
    ],
    "cna_assigner": "eclipse",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61891.json"
}
References

Affected packages

Git / github.com/eclipse-theia/theia

Affected ranges

Type
GIT
Repo
https://github.com/eclipse-theia/theia
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
172494ea2564ca07690e230805861146007fae79
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ],
    "cpe": "cpe:2.3:a:eclipse:theia:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.74.0"
        }
    ]
}

Affected versions

0.*
0.0.1-alpha.1
0.0.1-alpha.2
1.*
1.13.0
Other
next
v0.*
v0.1.0
v0.1.1
v0.10.0
v0.11.0
v0.12.0
v0.13.0
v0.14.0
v0.15.0
v0.16.0
v0.2.0
v0.2.1
v0.2.2
v0.2.3
v0.2.4
v0.3.0
v0.3.1
v0.3.10
v0.3.11
v0.3.12
v0.3.13
v0.3.14
v0.3.15
v0.3.16
v0.3.17
v0.3.18
v0.3.19
v0.3.2
v0.3.3
v0.3.4
v0.3.8
v0.3.9
v0.4.0
v0.5.0
v0.6.0
v0.7.0
v0.8.0
v0.9.0
v1.*
v1.0.0
v1.1.0
v1.10.0
v1.11.0
v1.12.0
v1.13.0
v1.14.0
v1.15.0
v1.16.0
v1.17.0
v1.2.0
v1.20.0
v1.21.0
v1.22.0
v1.22.1
v1.23.0
v1.24.0
v1.25.0
v1.26.0
v1.27.0
v1.28.0
v1.29.0
v1.3.0
v1.30.0
v1.31.0
v1.32.0
v1.33.0
v1.34.0
v1.35.0
v1.36.0
v1.37.0
v1.38.0
v1.39.0
v1.4.0
v1.40.0
v1.41.0
v1.42.0
v1.43.0
v1.44.0
v1.45.0
v1.46.0
v1.47.0
v1.48.0
v1.49.0
v1.5.0
v1.50.0
v1.52.0
v1.53.0
v1.54.0
v1.55.0
v1.56.0
v1.57.0
v1.58.0
v1.59.0
v1.6.0
v1.60.0
v1.61.0
v1.62.0
v1.63.0
v1.64.0
v1.65.0
v1.66.0
v1.67.0
v1.68.0
v1.69.0
v1.7.0
v1.70.0
v1.71.0
v1.72.0
v1.73.0
v1.8.0
v1.9.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61891.json"