CVE-2026-63443Network attack vectorHinoki check available

Cross-agent file access via redirect-following API client

Published Sep 15, 2026 · Updated Sep 15, 2026

SSRF in affected Coder releases allows remote authenticated users to read or write files across workspace and tenant boundaries. agentConn.apiClient follows attacker-supplied redirects, and its custom transport dials the redirected host whenever URL port 4 matches the agent API. Exploitation requires a modified workspace agent, another online agent's UUID, and tailnet reachability; process-API releases also allow commands to run as the victim workspace user.

CVSS severity8.3
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

SSRF in affected Coder releases allows remote authenticated users to read or write files across workspace and tenant boundaries. agentConn.apiClient follows attacker-supplied redirects, and its custom transport dials the redirected host whenever URL port 4 matches the agent API. Exploitation requires a modified workspace agent, another online agent's UUID, and tailnet reachability; process-API releases also allow commands to run as the victim workspace user.

The record

CVE
CVE-2026-63443
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
Coder
Product
Coder
Classifications
CWE-918, CWE-863, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.27.0, < 2.29.19
  2. Affected versionversion=>= 2.30.0, < 2.32.9
  3. Affected versionversion=>= 2.33.0, < 2.33.10
  4. Affected versionversion=>= 2.34.0, < 2.34.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Coder · Coderversion=>= 2.27.0, < 2.29.19; version=>= 2.30.0, < 2.32.9; version=>= 2.33.0, < 2.33.10; version=>= 2.34.0, < 2.34.4

Published CVSS scores

8.3CoderCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CWE-863Incorrect Authorization
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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