How to Fix CVE-2026-31271: n/a (Bundle Sibling)
*By Sai Kiran Pandrala*
Last verified: 2026-05-25
| Severity | CVSS 9.8, Critical |
|---|---|
| Actively exploited? | No |
| Affected | n/a (n/a) |
| Fixed in | Same patched build as CVE-2026-25212 |
| Type (CWE) | n/a |
CVE-2026-31271 is a sibling vulnerability in the same the vendor n/a advisory bundle as CVE-2026-25212. The same patched build closes every CVE in the bundle, so the remediation procedure for CVE-2026-31271 matches the primary write-up.
What is different about CVE-2026-31271?
megagao production_ssm v1.0 contains an authorization bypass vulnerability in the user addition functionality. The insert() method in UserController.java lacks authentication checks, allowing unauthenticated attackers to create super administrator accounts by directly accessing the /user/insert endpoint. This leads to complete system compromise.
Impact is consistent with the bundle: a security bypass on the affected component. The patched build closes every code path in the advisory in one update.
How to fix CVE-2026-31271
Apply the patched build per the primary write-up: How to Fix CVE-2026-25212.
For a quick check, confirm the running version of n/a:
# Confirm the installed version via your package manager
dpkg -l | grep -i n/a # Debian/Ubuntu
rpm -qa | grep -i n/a # RHEL/CentOS/Rocky
Frequently asked questions
Is CVE-2026-31271 being actively exploited?
Not at the time of writing. It is not listed in CISA's Known Exploited Vulnerabilities catalog. That status can change, so monitor the vendor advisory and the KEV catalog if the system is exposed.
How severe is CVE-2026-31271?
CVSS rates it 9.8 (Critical). Use that score to set your patch priority alongside the other items in your queue.
Do I have to take n/a offline to apply the patch?
It depends on the deployment. High-availability or clustered installs can usually patch one node at a time with no full outage. Standalone installs typically need a short restart. Always follow the vendor's documented upgrade steps.
What if my vulnerability scanner still flags CVE-2026-31271 after I patch?
Re-run the scan after a service restart, then confirm the scanner's plugin set is up to date. Some scanners detect by banner version only and lag the official fix metadata by a release.
References
- Official vendor advisory: https://github.com/clockw1se0v0/Vul/blob/main/production_ssm/Unauthorized.md
- NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2026-31271
- CISA KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
- Primary write-up: How to Fix CVE-2026-25212
*Written by Sai Kiran Pandrala. Last verified 2026-05-25. Part of the the vendor n/a advisory bundle. Full procedure at how-to-fix-cve-2026-25212.*