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TI-2026-80034 Aliases CVE-2026-107887GHSA-q8c9-qpq5-4xhg

Missing authorization in Advanced Twenty Seventeen allows theme switch

Priority LOW 23CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · Low
Fix status
No fix listed

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

Summary

The Advanced Twenty Seventeen WordPress plugin through 1.3.1 performs no capability or nonce check on the ats_create_child_theme action (CWE-862). Any authenticated user, such as a subscriber, can switch the site's active theme, and the same action can be triggered through cross-site request forgery against any logged-in user, including an administrator. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

The Advanced Twenty Seventeen WordPress plugin through 1.3.1 does not perform any capability or nonce check on the action that creates and activates its bundled child , allowing any authenticated user such as a subscriber to switch the site's active site-wide, and allowing the same action to be triggered against any logged-in user including an administrator via CSRF.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00142 3rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

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
UnknownAdvanced Twenty Seventeenup to 1.3.1—No fix listedCNA
  • Advanced Twenty Seventeen VendorUnknown Affected up to 1.3.1 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Advanced Twenty Seventeen.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

  1. 2026-10-24 Threatist record created from CVE-2026-107887
  2. 2026-10-24 Alias added: GHSA-q8c9-qpq5-4xhg
  3. 2026-10-24 CVSS score added · CISA ADP
  4. 2026-10-24 Weakness changed · CISA ADP
  5. 2026-10-24 CISA SSVC decision points changed

References

Exploit 1

Sources

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