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TI-2026-55479 Aliases CVE-2026-80338GHSA-vf5h-xv4f-wc7g

CMB2 < 2.13.0 - Subscriber+ Arbitrary Option Corruption via oEmbed Handler

Priority LOW 29CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-862.

Summary

The CMB2 WordPress plugin before 2.13.0 does not perform any capability check on one of its AJAX actions, allowing users with a role as low as Subscriber to create arbitrary WordPress options and corrupt existing ones, which can break core site settings and take the site offline. Exploitation requires the site's or another CMB2 WordPress plugin before 2.13.0 to have declared an oEmbed field, as the CMB2 WordPress plugin before 2.13.0 registers none of its own. The stored value is never attacker-controlled, so the issue does not lead to privilege escalation.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00197 9th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed CMB2 (Unknown): 2.13.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
UnknownCMB2before 2.13.02.13.0Patch availableCNA
  • CMB2 VendorUnknown Affected before 2.13.0 Fixed in 2.13.0 Patch available CNA

Remediation

  • Fix · CNA CMB2 (Unknown) Fixed in 2.13.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-80338
  2. 2026-10-03 Alias added: GHSA-vf5h-xv4f-wc7g

References

Exploit 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences