Secuno
ENNL
Book demo

CVE-2026-42088

Openc3 Cosmos privilege escalation

9.6 CRITICALPublic exploitEPSS 0.49%
  1. Published4 May 2026

Description

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. Prior to version 7.0.0-rc3, the Script Runner widget allows users to execute Python and Ruby scripts directly from the openc3-COSMOS-script-runner-api container. Because all the docker containers share a network, users can execute specially crafted scripts to bypass the API permissions check and perform administrative actions, including reading and modifying data inside the Redis database, which can be used to read secrets and change COSMOS settings, as well as read and write to the buckets service, which holds configuration, log, and plugin files. These actions are normally only available from the Admin Console or with administrative privileges. Any user with permission to create and run scripts can connect to any service in the docker network. This issue has been patched in version 7.0.0-rc3.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Affected products

Openc3 Cosmos7.0.0 · < 7.0.0

Remediation

Fixed in
Openc3 Cosmos≥ 7.0.0

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-92099.8
mJobTime through build 15.7.3.32 contains an unauthenticated SQL execution…
CVE-2026-1063788.3
Privilege elevation in Sandbox in Google Chrome on on Mac prior to 155.0.8059.39…
CVE-2026-662468.8
iControl is affected by a Broken Access Control vulnerability, which could allow an…
CVE-2026-888088.8
A vulnerability has been identified within Rancher Manager where the Fleet agent wrote…
CVE-2026-847878.1
ZohoCorp ManageEngine OpManager and Firewall Analyzer versions 12.8.710 and below were…
CVE-2026-7752110.0
MaxKB is an open-source AI assistant for enterprise. Prior to version 2.10.5-lts,…

Frequently asked

Is CVE-2026-42088 being actively exploited?

CVE-2026-42088 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.49%.

How severe is CVE-2026-42088?

CVE-2026-42088 has a CVSS 3.1 base score of 9.6, rated critical. EPSS estimates a 0.49% probability of exploitation.

Which products are affected by CVE-2026-42088?

Affected products include Openc3 Cosmos.

How do I fix CVE-2026-42088?

Upgrade affected software to a fixed version, for example Openc3 Cosmos 7.0.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-42088 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.