PT-2026-36878 · Unknown · Openc3 Cosmos

Ctrlsill · Published 2026-04-22 · Updated 2026-05-08 · CVE-2026-42084

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions OpenC3 COSMOS versions prior to 6.10.5 OpenC3 COSMOS versions prior to 7.0.0-rc3

Description The password change functionality allows a user to change their password without providing the current password, as the system accepts a valid session token instead. In a breach scenario, an attacker with a valid session token can exploit this to maintain persistence in a hijacked account, including administrative accounts, and block legitimate users from accessing the account.

Recommendations Update to version 6.10.5. Update to version 7.0.0-rc3.

Exploit

Fix

Weakness Enumeration

CWE-620

Related Identifiers

CVE-2026-42084

GHSA-WGX6-G857-JJF7

Affected Products

Openc3 Cosmos

References · 12

• 🔥 https://github.com/rubysec/ruby-advisory-db/blob/master/gems/openc3/CVE-2026-42084.yml · Exploit
• 🔥 https://github.com/OpenC3/cosmos/security/advisories/GHSA-wgx6-g857-jjf7 · Exploit
• https://github.com/OpenC3/cosmos/commit/2e623714e3426d5ae81b6f8239d4a2a6937ef776 · Patch
• https://osv.dev/vulnerability/GHSA-wgx6-g857-jjf7 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-42084 · Security Note
• https://github.com/OpenC3/cosmos · Note
• https://github.com/OpenC3/cosmos/releases/tag/v6.10.5 · Note
• https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3 · Note
• https://t.me/cveNotify/162782 · Telegram Post
• https://twitter.com/CVEnew/status/2051361267122614414 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2051395973306339379 · Twitter Post
• https://t.me/cveNotify/162544 · Telegram Post