FKIE_CVE-2026-63443
Vulnerability from fkie_nvd - Published: 2026-09-15 17:17 - Updated: 2026-09-15 18:17
Severity
Summary
Coder allows organizations to provision remote development environments via Terraform. Prior to 2.29.19, 2.32.9, 2.33.10, and 2.34.4, agentConn.apiClient() follows redirects while its custom transport accepts the host from the redirected request URL when the port is the workspace agent HTTP API port 4. An authenticated user who controls a modified workspace agent and knows another online agent's UUID can derive the victim's tailnet address and redirect control-plane requests to that agent. HTTP 301, 302, and 303 redirects can redirect read requests, while HTTP 307 and 308 preserve replayable write and process-start requests. The redirected workspace agent file APIs can read or write files as the victim workspace user, and affected versions exposing the workspace agent process API can execute commands after a redirected file write, crossing workspace and tenant boundaries. This issue is fixed in versions 2.29.19, 2.32.9, 2.33.10, and 2.34.4.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"product": "coder",
"vendor": "coder",
"versions": [
{
"status": "affected",
"version": "\u003e= 2.27.0, \u003c 2.29.19"
},
{
"status": "affected",
"version": "\u003e= 2.30.0, \u003c 2.32.9"
},
{
"status": "affected",
"version": "\u003e= 2.33.0, \u003c 2.33.10"
},
{
"status": "affected",
"version": "\u003e= 2.34.0, \u003c 2.34.4"
}
]
}
],
"source": "security-advisories@github.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Coder allows organizations to provision remote development environments via Terraform. Prior to 2.29.19, 2.32.9, 2.33.10, and 2.34.4, agentConn.apiClient() follows redirects while its custom transport accepts the host from the redirected request URL when the port is the workspace agent HTTP API port 4. An authenticated user who controls a modified workspace agent and knows another online agent\u0027s UUID can derive the victim\u0027s tailnet address and redirect control-plane requests to that agent. HTTP 301, 302, and 303 redirects can redirect read requests, while HTTP 307 and 308 preserve replayable write and process-start requests. The redirected workspace agent file APIs can read or write files as the victim workspace user, and affected versions exposing the workspace agent process API can execute commands after a redirected file write, crossing workspace and tenant boundaries. This issue is fixed in versions 2.29.19, 2.32.9, 2.33.10, and 2.34.4."
}
],
"id": "CVE-2026-63443",
"lastModified": "2026-09-15T18:17:29.010",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 8.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 5.5,
"source": "security-advisories@github.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-63443",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-15T17:31:25.407398Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-09-15T17:17:23.567",
"references": [
{
"source": "security-advisories@github.com",
"url": "https://github.com/coder/coder/commit/2312b67bc52c4e314c18c4b4be5dcf5500c94ad7"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/coder/coder/commit/812549d671d0f5a0b45adcee860d37b70aaddccd"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/coder/coder/commit/ec3ba84c0002f47dd979c073cde1ab345acbaea5"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/coder/coder/commit/eeb2624549ddb85538e493af3e678fdb185a809f"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/coder/coder/commit/f8bdec5add4711650d5bfb6ff93d0cc9d7821c81"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/coder/coder/pull/26600"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/coder/coder/pull/26611"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/coder/coder/pull/26612"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/coder/coder/pull/26613"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/coder/coder/pull/26622"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/coder/coder/releases/tag/v2.29.19"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/coder/coder/releases/tag/v2.32.9"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/coder/coder/releases/tag/v2.33.10"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/coder/coder/releases/tag/v2.34.4"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/coder/coder/security/advisories/GHSA-qrwj-vh9x-gw5v"
}
],
"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Received",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-863"
},
{
"lang": "en",
"value": "CWE-918"
}
],
"source": "security-advisories@github.com",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
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.
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