Information disclosure in Passster
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 outputs password-protected block content in the public page response before verifying the password, allowing unauthenticated users to recover the protected content without knowing the password.
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | Passster | before 4.3.6 | 4.3.6 | Patch available | CNA |
- 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-2026-13854 Content Protector (Passster) < 4.3.6 - Unauthenticated Category-Locked Content Disclosure via Core REST APIPriority HIGH 72
- TI-2026-13853 Content Protector (Passster) < 4.3.6 - Unauthenticated Non-Public Post Content Disclosure via Captcha REST EndpointPriority HIGH 72
Timeline
- 2026-10-02 Threatist record created from CVE-2026-16604
- 2026-10-03 Alias added: GHSA-74rr-m8c4-9693
References
Sources
- CVE-2026-16604 · CVE Program
- CVE-2026-16604 · NVD
- FIRST EPSS
- GHSA-74rr-m8c4-9693 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences