{"id":"CVE-2026-2355","aliases":["EUVD-2026-9392","GHSA-2w6m-q82q-c77g"],"status":"published","title":"My Calendar – Accessible Event Manager \u003c= 3.7.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes","description":"The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `template` attribute of the `[my_calendar_upcoming]` shortcode in all versions up to, and including, 3.7.3. This is due to the use of `stripcslashes()` on user-supplied shortcode attribute values in the `mc_draw_template()` function, which decodes C-style hex escape sequences (e.g., `\\x3c` to `\u003c`) at render time, bypassing WordPress's `wp_kses_post()` content sanitization that runs at save time. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.","severity":{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00304,"percentile":0.23427,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-03-04T11:22:29Z","modified":"2026-06-17T10:30:49Z","products":[{"vendor":"joedolson","product":"my calendar – accessible event manager"}],"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/03d5c82e-f82f-4156-bb3e-e6eb365a6c36?source=cve"},{"url":"https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.7.2/my-calendar-shortcodes.php#L112"},{"url":"https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.7.2/my-calendar-templates.php#L83"},{"url":"https://plugins.trac.wordpress.org/browser/my-calendar/trunk/my-calendar-templates.php#L83"},{"url":"https://plugins.trac.wordpress.org/browser/my-calendar/trunk/my-calendar-shortcodes.php#L112"},{"url":"https://plugins.trac.wordpress.org/changeset?sfp_email=\u0026sfph_mail=\u0026reponame=\u0026new=3464603%40my-calendar%2Ftrunk\u0026old=3454989%40my-calendar%2Ftrunk\u0026sfp_email=\u0026sfph_mail=#file6"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2355"},{"url":"https://github.com/advisories/GHSA-2w6m-q82q-c77g"}],"sources":{"cve":[{"id":"CVE-2026-2355","title":"My Calendar – Accessible Event Manager \u003c= 3.7.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes","description":"The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `template` attribute of the `[my_calendar_upcoming]` shortcode in all versions up to, and including, 3.7.3. This is due to the use of `stripcslashes()` on user-supplied shortcode attribute values in the `mc_draw_template()` function, which decodes C-style hex escape sequences (e.g., `\\x3c` to `\u003c`) at render time, bypassing WordPress's `wp_kses_post()` content sanitization that runs at save time. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.","status":"published","published":"2026-03-04T11:22:29.62Z","modified":"2026-04-08T16:33:01.86Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T13:48:35.749498Z"}],"euvd":[{"id":"EUVD-2026-9392","description":"The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `template` attribute of the `[my_calendar_upcoming]` shortcode in all versions up to, and including, 3.7.3. This is due to the use of `stripcslashes()` on user-supplied shortcode attribute values in the `mc_draw_template()` function, which decodes C-style hex escape sequences (e.g., `\\x3c` to `\u003c`) at render time, bypassing WordPress's `wp_kses_post()` content sanitization that runs at save time. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.","status":"published","published":"2026-03-04T11:22:29Z","modified":"2026-04-08T16:33:01Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T19:25:11.239745Z"}],"ghsa":[{"id":"GHSA-2w6m-q82q-c77g","title":"The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Stored Cross...","description":"The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `template` attribute of the `[my_calendar_upcoming]` shortcode in all versions up to, and including, 3.7.3. This is due to the use of `stripcslashes()` on user-supplied shortcode attribute values in the `mc_draw_template()` function, which decodes C-style hex escape sequences (e.g., `\\x3c` to `\u003c`) at render time, bypassing WordPress's `wp_kses_post()` content sanitization that runs at save time. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.","status":"published","published":"2026-03-04T12:30:29Z","modified":"2026-03-04T12:30:39Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:06:26.357639Z"}],"nvd":[{"id":"CVE-2026-2355","description":"The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `template` attribute of the `[my_calendar_upcoming]` shortcode in all versions up to, and including, 3.7.3. This is due to the use of `stripcslashes()` on user-supplied shortcode attribute values in the `mc_draw_template()` function, which decodes C-style hex escape sequences (e.g., `\\x3c` to `\u003c`) at render time, bypassing WordPress's `wp_kses_post()` content sanitization that runs at save time. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.","status":"published","published":"2026-03-04T12:16:03.023Z","modified":"2026-06-17T10:30:49.91Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:07.420927Z"}]}}