Predictable booking hash in Booking Calendar WordPress plugin exposes bookings
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-326.
Summary
The Booking Calendar WordPress plugin before 11.8 generates its per-booking access hashes with low entropy, deriving each from a time-seeded value (CWE-326). An unauthenticated attacker who can determine a booking's creation time can predict the hash and read that booking's personal data or modify the booking.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
Description from the CNA
The Booking Calendar WordPress plugin before 11.8 does not generate its per-booking access hashes with sufficient entropy, deriving each from a low-entropy time-seeded value, which can allow unauthenticated attackers who are able to determine a booking's creation time to predict the hash and then read that booking's personal data or modify the booking in place.
Why it matters now
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | Booking Calendar | before 11.8 | 11.8 | Patch available | CNA |
- Booking Calendar VendorUnknown Affected before 11.8 Fixed in 11.8 Patch available CNA
Remediation
Update Booking Calendar to version 11.8 or later.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
- Fix · CNA Booking Calendar (Unknown) Fixed in 11.8
Timeline
- 2026-10-08 Threatist record created from CVE-2026-105193
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences