Content Protector (Passster) < 4.3.9 - Unauthenticated Protected Content Disclosure via REST Path Allowlist Bypass
Priority LOW 30CWE-863Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-863.
Summary
The Passster WordPress plugin before 4.3.9 does not correctly match its own public endpoint paths when deciding which REST API requests may bypass global password protection, comparing them as an unanchored substring of the request URI rather than against the resolved route, allowing an unauthenticated attacker to read the content of globally password-protected posts and pages.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0035 28th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Passster (Unknown): 4.3.9
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- 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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | Passster | 4.3.3 to before 4.3.9 | 4.3.9 | Patch available | CNA |
- Passster VendorUnknown Affected 4.3.3 to before 4.3.9 Fixed in 4.3.9 Patch available CNA
Remediation
- Fix · CNA Passster (Unknown) Fixed in 4.3.9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-17559
- 2026-10-03 Alias added: GHSA-w4ph-xfmv-g57q
References
Sources
- CVE-2026-17559 · CVE Program
- CVE-2026-17559 · NVD
- FIRST EPSS
- GHSA-w4ph-xfmv-g57q · GitHub Advisory Database · CC BY 4.0
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