The Events Calendar <= 6.17.4 - Unauthenticated PHP Object Injection to Remote Code Execution
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-502.
Summary
The The Events Calendar plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 6.17.4 via the is_safe_widget_instance function. This is due to insufficient protection in is_safe_widget_instance, which can be bypassed because PHP fires magic methods during its pre-parse, combined with enable_rendering_widget_copied() forging a valid wp_hash integrity attribute before unserialize() is reached. This makes it possible for unauthenticated attackers to execute code on the server. This is exploitable without authentication or approval because the plugin's V2 single-event template runs do_blocks() over buffered comment HTML, and WordPress returns a moderation-hash URL that allows an unauthenticated commenter to immediately view their own pending comment, delivering the injected block markup to the vulnerable code path before any moderation occurs. This does require comments to be enabled and visible on events.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-78006
- 2026-10-03 Alias added: GHSA-4q25-cq4p-f83q
References
Other 7
- https://www.wordfence.com/threat-intel/vulnerabilities/id/a0c67346-534a-4b67-a904-fa148703707a?source=cve
- https://plugins.trac.wordpress.org/browser/the-events-calendar/tags/6.17.3/src/Tribe/Views/V2/Template_Bootstrap.php#L213
- https://plugins.trac.wordpress.org/browser/the-events-calendar/tags/6.17.3/src/Tribe/Views/V2/Widgets/Service_Provider.php#L295
- https://plugins.trac.wordpress.org/browser/the-events-calendar/tags/6.17.3/src/Tribe/Views/V2/Widgets/Service_Provider.php#L255
- https://plugins.trac.wordpress.org/browser/the-events-calendar/tags/6.17.3/src/Tribe/Collections/Lazy_Post_Collection.php#L82
- https://plugins.trac.wordpress.org/browser/the-events-calendar/tags/6.17.3/common/src/Tribe/Utils/Collection_Trait.php#L247
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3690576%40the-events-calendar&new=3690576%40the-events-calendar
More stellarwp vulnerabilities
- TI-2024-05498 Deserialization of untrusted data in stellarwp GiveWP – Donation Plugin and Fundraising… CVSS 3.1CRITICAL 10.0
- TI-2023-02655 BookIt <= 2.3.7 - Authentication Bypass CVSS 3.1CRITICAL 9.8
- TI-2024-07671 The Events Calendar <= 6.6.4 - Unauthenticated SQL Injection CVSS 3.1CRITICAL 9.8
- TI-2024-03888 The Events Calendar < 6.4.0.1 - Reflected XSS CVSS 3.1CRITICAL 9.1
- TI-2024-07745 GiveWP – Donation Plugin and Fundraising Platform <= 3.16.1 - Unauthenticated PHP Object Injection CVSS 3.1CRITICAL 9.8
- TI-2024-04952 The Events Calendar < 6.8.2.1 - Unauthenticated Password Protected Event Disclosure CVSS 3.1MEDIUM 5.3
Sources
- CVE-2026-78006 · CVE Program
- CVE-2026-78006 · NVD
- FIRST EPSS
- GHSA-4q25-cq4p-f83q · 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