Incorrect authorization in Simply Schedule Appointments
Priority HIGH 72CWE-863Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- 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-863.
Summary
The Simply Schedule Appointments WordPress plugin before 1.6.12.6 does not correctly restrict a bulk appointment operation to the requester's own records, allowing unauthenticated users to retrieve the personal data of all appointments across the site and, on premium editions, to permanently delete them.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00406 35th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Simply Schedule Appointments (Unknown): 1.6.12.6
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 | Simply Schedule Appointments | before 1.6.12.6 | 1.6.12.6 | Patch available | CNA |
- Simply Schedule Appointments VendorUnknown Affected before 1.6.12.6 Fixed in 1.6.12.6 Patch available CNA
Remediation
- Fix · CNA Simply Schedule Appointments (Unknown) Fixed in 1.6.12.6
Timeline
- 2026-10-02 Threatist record created from CVE-2026-16540
- 2026-10-03 Alias added: GHSA-j5pv-734r-xv95
References
Sources
- CVE-2026-16540 · CVE Program
- CVE-2026-16540 · NVD
- FIRST EPSS
- GHSA-j5pv-734r-xv95 · 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