CVE-2026-11896 | My Calendar <= 3.7.14 - Insecure Direct Object Reference to Unauthenticated Sensitive Information Disclosure via 'vcal' Parameter

The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 3.7.14 via the 'vcal' parameter due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to enumerate occurrence IDs and access the full iCalendar export of non-public, draft, trashed, and personal calendar events, disclosing sensitive event metadata including titles, descriptions, dates, locations, organizer and host details, permalinks, and related calendar metadata.

Published: 2026-07-02 Last update: 2026-07-02 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-11896 is rated Low Risk (29.1/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.31%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-11896

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-07-03 0.54% 0.31% -0.23%
2 2026-07-02 — 0.54% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-11896

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]

Weakness enumeration for CVE-2026-11896

GitHub Security Advisory for CVE-2026-11896

GHSA-rfww-46mr-4mrf · Severity: medium — The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Insecure Direct...

Affected software / configurations for CVE-2026-11896

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2026-11896

URL Tags
https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.7.14/includes/date-utilities.php#L417
https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.7.14/includes/ical.php#L26
https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.7.14/my-calendar-api.php#L212
https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.7.14/my-calendar-api.php#L246
https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.7.14/my-calendar-events.php#L748
https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.7.14/my-calendar.php#L209
https://plugins.trac.wordpress.org/browser/my-calendar/trunk/includes/date-utilities.php#L417
https://plugins.trac.wordpress.org/browser/my-calendar/trunk/includes/ical.php#L26
https://plugins.trac.wordpress.org/browser/my-calendar/trunk/my-calendar-api.php#L212
https://plugins.trac.wordpress.org/browser/my-calendar/trunk/my-calendar-api.php#L246
https://plugins.trac.wordpress.org/browser/my-calendar/trunk/my-calendar-events.php#L748
https://plugins.trac.wordpress.org/browser/my-calendar/trunk/my-calendar.php#L209
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3572191%40my-calendar&new=3572191%40my-calendar&sfp_email=&sfph_mail=
https://www.wordfence.com/threat-intel/vulnerabilities/id/a72639df-fa05-414c-b30c-eb285f59d945?source=cve
cvelogic Threat Intelligence