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TI-2026-13854 Aliases CVE-2026-16603GHSA-w2h3-gqm7-9j89

Content Protector (Passster) < 4.3.6 - Unauthenticated Category-Locked Content Disclosure via Core REST API

Priority HIGH 72CWE-200Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-200.

Summary

The Passster WordPress plugin before 4.3.6 does not enforce its category-based content protection on the WordPress REST API, allowing unauthenticated users to read the full content, title, and excerpt of category-locked posts through the core REST API.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00434 37th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Passster (Unknown): 4.3.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
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
UnknownPasssterbefore 4.3.64.3.6Patch availableCNA
  • Passster VendorUnknown Affected before 4.3.6 Fixed in 4.3.6 Patch available CNA

Remediation

  • Fix · CNA Passster (Unknown) Fixed in 4.3.6

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Passster 4.3.6

    3 records Highest priority Priority HIGH 3 HIGH

    Other records, highest priority first

    • TI-2026-13855 Information disclosure in PasssterPriority HIGH 72
    • TI-2026-13853 Content Protector (Passster) < 4.3.6 - Unauthenticated Non-Public Post Content Disclosure via Captcha REST EndpointPriority HIGH 72
    Show all 3 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-16603
  2. 2026-10-03 Alias added: GHSA-w2h3-gqm7-9j89

References

Exploit 1

Sources

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