High · CVSS 8.7CVE-2026-126308

Coder 2.38.0 before 2.38.2 Session Token Leak via Sub-Agent External AppsCVE-2026-126308

Answer in brief

CVE-2026-126308 records a High severity (CVSS 8.7) vulnerability in Coder 2.38.0 before 2.38.2 Session Token Leak via Sub-Agent External Apps. The current sources do not mark it as known exploited. The current feed maps coder/coder (generic), coder/coder (generic), coder/coder (generic), coder/coder (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 13, 2026Updated Nov 13, 2026Source checked Nov 13, 2026First seen by HOL Nov 13, 2026Material review Nov 13, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.7
Exploitation: Not marked as known exploited
Affected software: 6 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps coder/coder (generic), coder/coder (generic), coder/coder (generic), coder/coder (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
coder/codergeneric	>=2.38.0 <2.38.2	2.38.2
coder/codergeneric	>=2.37.0 <2.37.6	2.37.6
coder/codergeneric	>=2.36.0 <2.36.9	2.36.9
coder/codergeneric	>=2.30.0 <2.34.14	2.34.14
coder/codergeneric	>=2.24.0 <2.29.23	2.29.23
coder/codergeneric	>=2.35.0 <2.36.0	2.36.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for coder/coder, coder/coder, coder/coder.
Review the reported fix. Update coder/coder to 2.38.2; coder/coder to 2.37.6; coder/coder to 2.36.9; coder/coder to 2.34.14; coder/coder to 2.29.23; coder/coder to 2.36.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Nov 13, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Nov 13, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Nov 13, 2026

Sources and claim methodology

Upstream source description

The web dashboard in Coder 2.24.0 before 2.29.23, 2.30.0 before 2.34.14, 2.35.0 before 2.36.9, 2.37.0 before 2.37.6, and 2.38.0 before 2.38.2 replaces the $SESSION_TOKEN placeholder in external app URLs with a full-access API key without checking whether the app belongs to a sub-agent. Code running in a workspace can register a disguised sub-agent app with a custom protocol URL, so the owner's click sends their API key to an attacker-chosen destination.

Quoted source text, attributed separately from HOL analysis.

Affected scope and exposure questions

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
coder/codergeneric	>=2.38.0 <2.38.2	2.38.2
coder/codergeneric	>=2.37.0 <2.37.6	2.37.6
coder/codergeneric	>=2.36.0 <2.36.9	2.36.9
coder/codergeneric	>=2.30.0 <2.34.14	2.34.14
coder/codergeneric	>=2.24.0 <2.29.23	2.29.23
coder/codergeneric	>=2.35.0 <2.36.0	2.36.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for coder/coder, coder/coder, coder/coder.

Review the reported fix. Update coder/coder to 2.38.2; coder/coder to 2.37.6; coder/coder to 2.36.9; coder/coder to 2.34.14; coder/coder to 2.29.23; coder/coder to 2.36.0 if you use the affected versions. Test the change in a non-production environment first.

Sources and claim methodology

Upstream source description

Quoted source text, attributed separately from HOL analysis.