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No exploitation reportedAwaiting NVD analysis

CVE-2026-126308

Coder 2.38.0 before 2.38.2 Session Token Leak via Sub-Agent External Apps

No exploitation reported by the sources we read.

  • Published2026-11-13
  • WeaknessCWE-201

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-11-1309:36CVE publishedCNA

Versions per branch

Products declared by the CNA

As VulnCheck, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • coderother versions: not affected
    Affected
    • ≥ 2.38.0, < 2.38.2fixed in 2.38.2semver

    Not affected = 2.38.2

  • coderother versions: not affected
    Affected
    • ≥ 2.37.0, < 2.37.6fixed in 2.37.6semver

    Not affected = 2.37.6

  • coderother versions: not affected
    Affected
    • ≥ 2.36.0, < 2.36.9fixed in 2.36.9semver

    Not affected = 2.36.9

  • coderother versions: not affected
    Affected
    • ≥ 2.30.0, < 2.34.14fixed in 2.34.14semver

    Not affected = 2.34.14

  • coderother versions: not affected
    Affected
    • ≥ 2.24.0, < 2.29.23fixed in 2.29.23semver

    Not affected = 2.29.23

  • coderother versions: not affected
    Affected
    • ≥ 2.35.0, < 2.36.0fixed in 2.36.0semver

    Not affected = 2.36.0

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-13

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-126308 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 4.08.72026-11-13
  • CNACVSS 3.17.72026-11-13
  • NVDCVSS 3.17.7read 2026-11-13
  • CNAweakness (CWE)CWE-2012026-11-13
  • NVDweakness (CWE)CWE-201read 2026-11-13
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-11-13
Last Modified
2026-11-13
NVD status
Received
GitHub Advisory
GHSA-h95g-897g-9949

Frequently asked questions

What is CVE-2026-126308?

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.

Is CVE-2026-126308 actively exploited?

Active exploitation of CVE-2026-126308 has not been confirmed.

What is the CVSS score for CVE-2026-126308?

CVE-2026-126308 has a CVSS v3 base score of 7.7 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N.

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