CVE-2026-40308
- Source
- https://cve.org/CVERecord?id=CVE-2026-40308
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40308.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-40308
- Aliases
- Published
- 2026-04-16T21:30:52Z
- Modified
- 2026-10-28T02:30:46Z
- Severity
-
- 8.8 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- My Calendar: Unauthenticated Information Disclosure (IDOR) via Multisite switch_to_blog
- Details
-
My Calendar is a WordPress plugin for managing calendar events. In versions 3.7.6 and below, the mc_ajax_mcjs_action AJAX endpoint, registered for unauthenticated users, passes user-supplied arguments through parse_str() without validation, allowing injection of arbitrary parameters including a site value. On WordPress Multisite installations, this enables an unauthenticated attacker to call switch_to_blog() with an arbitrary site ID and extract calendar events from any sub-site on the network, including private or hidden events. On standard Single Site installations, switch_to_blog() does not exist, causing an uncaught PHP fatal error and crashing the worker thread, creating an unauthenticated denial of service vector. This issue has been fixed in version 3.7.7.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-639" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40308.json" }- References
Affected packages
Git / github.com/joedolson/my-calendar
Affected ranges
- Type
- GIT
- Repo
- https://github.com/joedolson/my-calendar
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "0" }, { "fixed": "3.7.7" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "original_tag": "v3.7.7", "range": [ { "fixed": "9b58483dccb75a596014213ffe3376eb2d330f1a" } ], "source": "REFERENCES_TAG" } ] }