CVE-2026-63239: Koollab LMS Credential Exposure Flaw

CVE-2026-63239 Overview

CVE-2026-63239 is a hard-coded credentials vulnerability [CWE-798] in Koollab LMS. The application embeds AWS Identity and Access Management (IAM) credentials directly in its codebase. An attacker who extracts these credentials gains access to shared multi-tenant Amazon Simple Storage Service (S3) buckets and Amazon Simple Queue Service (SQS) queues used by the platform.

The exposure enables cross-tenant data disclosure, malicious content injection into shared storage, manipulation of queued jobs, and interception of email traffic routed through the affected queues.

Critical Impact
Extracted AWS IAM credentials grant an authenticated attacker read and write access to multi-tenant S3 buckets and SQS queues, breaking tenant isolation across the Koollab LMS platform.

Affected Products

Koollab LMS (specific version range not published in the NVD entry)

Discovery Timeline

2026-07-29 - CVE-2026-63239 published to the National Vulnerability Database
2026-07-30 - Last updated in NVD database

Technical Details for CVE-2026-63239

Vulnerability Analysis

The vulnerability stems from static AWS IAM access keys embedded in the Koollab LMS distribution. Any actor who obtains the application binaries, container images, or client-side artifacts can recover the credentials through static analysis or file inspection.

The recovered IAM principal is shared across all tenants of the platform. Because Koollab LMS provisions a single set of S3 buckets and SQS queues for multi-tenant workloads, a single credential leak collapses tenant boundaries. An attacker can list objects belonging to other customers, overwrite shared assets with malicious payloads, and read or drain SQS messages that carry job metadata and email delivery instructions.

The attack requires network access to AWS endpoints and a low-privileged application context to obtain the artifact. User interaction is required in the referenced CVSS scoring, reflecting the retrieval step. Confidentiality and integrity are both affected; availability impact is scored as none.

Root Cause

The root cause is the storage of long-lived AWS IAM access keys inside the application rather than sourcing them from an external secret store, instance metadata service, or federated identity provider. This design defeats the AWS shared responsibility model for credential hygiene and violates the least-privilege principle.

Attack Vector

An attacker with legitimate low-privilege access to Koollab LMS retrieves application artifacts and extracts the embedded access key ID and secret access key. Using the AWS Command Line Interface (CLI) or SDK, the attacker authenticates directly to AWS APIs. From there, the attacker enumerates the shared S3 buckets, downloads or overwrites tenant objects, and interacts with SQS queues to read, delete, or inject messages that drive backend jobs and email dispatch.

No exploitation code is published in the referenced advisory. See the CSA Security Alert for the vendor-coordinated advisory text.

Detection Methods for CVE-2026-63239

Indicators of Compromise

AWS CloudTrail events showing S3 GetObject, PutObject, or ListBucket calls originating from IP addresses outside the Koollab LMS production ranges.
SQS ReceiveMessage, SendMessage, or DeleteMessage API calls issued by the shared IAM principal from unexpected user-agent strings such as aws-cli/* on non-production hosts.
Unexpected modifications to shared S3 objects, particularly email templates, job payloads, or tenant-uploaded content.

Detection Strategies

Enable AWS CloudTrail data events for the S3 buckets and SQS queues referenced by Koollab LMS and forward the logs to a centralized analytics platform.
Correlate the IAM access key ID used by the application against the source IP and user-agent of every API call to identify use outside expected infrastructure.
Scan container images, Git repositories, and mobile or web client bundles for AWS access key patterns matching the IAM principal used by Koollab LMS.

Monitoring Recommendations

Alert on any use of the shared IAM key from outside allow-listed VPCs, NAT gateways, or corporate egress ranges.
Monitor SQS queue depth and message throughput for anomalies that may indicate injection, replay, or draining by an external actor.
Track S3 object version histories on shared buckets to detect overwrite activity affecting multiple tenants in a short interval.

How to Mitigate CVE-2026-63239

Immediate Actions Required

Rotate the AWS IAM access keys embedded in Koollab LMS and revoke the previous credentials.
Contact the Koollab LMS vendor for a fixed release that removes hard-coded credentials and sources secrets at runtime.
Review CloudTrail logs for the shared IAM principal across the full retention window and treat any out-of-band usage as a potential incident.

Patch Information

No patched version is listed in the NVD entry at the time of publication. Consult the CSA Security Alert and the Koollab LMS vendor for remediation guidance and updated builds.

Workarounds

Restrict the IAM policy attached to the shared principal to the minimum set of S3 prefixes and SQS queues required, and add aws:SourceIp or aws:SourceVpce conditions to bind usage to the production environment.
Migrate from long-lived access keys to short-lived credentials issued through IAM Roles for Service Accounts, EC2 instance profiles, or AWS Security Token Service (STS) federation.
Enforce per-tenant prefix isolation on S3 objects and per-tenant queues on SQS so that a single credential compromise does not expose all customers.

bash

# Example: restrict shared IAM principal to a known VPC endpoint and rotate keys
aws iam put-user-policy \
  --user-name koollab-lms-app \
  --policy-name koollab-lms-scoped \
  --policy-document file://scoped-policy.json

aws iam update-access-key \
  --user-name koollab-lms-app \
  --access-key-id AKIAEXAMPLEOLDKEY \
  --status Inactive

aws iam create-access-key --user-name koollab-lms-app