EUVD-2026-94491
GHSA-39v2-8xcx-xqhh
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable deserialization with no confirmed auth (PR:N), but practical exploitation depends on a usable POP gadget chain being present, so AC:H; full C/I/A impact retained if RCE is achieved.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
Lifecycle Timeline
2DescriptionCVE.org
Deserialization of Untrusted Data vulnerability in Liquid Web / StellarWP The Events Calendar allows Object Injection.
This issue affects The Events Calendar: from n/a through 6.17.4.
Articles & Coverage 1
AnalysisAI
PHP object injection in The Events Calendar WordPress plugin (all versions through 6.17.4, published by Liquid Web / StellarWP) allows an attacker to pass crafted serialized data into a deserialization code path and instantiate arbitrary PHP objects, which can escalate to code execution, data theft or full site compromise if a usable POP gadget chain exists in the plugin, WordPress core or any other installed theme/plugin. The supplied CVSS vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, 9.8) describes a remote, unauthenticated, no-interaction attack, but the advisory does not name the vulnerable endpoint, and comparable Patchstack object-injection findings frequently require at least a low-privilege authenticated session; our independent assessment therefore keeps the same impact ratings while treating exploitability as high-complexity (AC:H). …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
No credit card · 7-day full trial
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a code path in The Events Calendar (versions through 6.17.4) that deserializes attacker-controlled input via unserialize(), AND the presence of a usable PHP POP gadget chain in the plugin, WordPress core, or another installed component to convert object injection into concrete impact - object injection alone with no reachable gadget is typically inert. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The input assigns CVSS 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), implying fully remote, unauthenticated, low-complexity code-level compromise with high confidentiality, integrity and availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The provided data does not include an exact fixed version, so no vendor-released patch version can be quoted: the advisory establishes 6.17.4 as the last affected release, and the primary remediation is to update The Events Calendar to the first release published after 6.17.4 as listed by StellarWP/Liquid Web (check the plugin's WordPress.org changelog and the Patchstack advisory at https://patchstack.com/database/wordpress/plugin/the-events-calendar/vulnerability/wordpress-the-events-calendar-plugin-6-17-4-php-object-injection-vulnerability?_s_id=cve for the confirmed patched build). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all WordPress sites for The Events Calendar plugin versions through 6.17.4; if any are found, treat them as high risk, disable or remove the plugin where business operations permit, and if it must remain active, apply WAF or virtual patching rules to block PHP object injection and crafted serialized payloads, restrict access to plugin endpoints, and preserve logs for investigation. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
More in The Events Calendar
View allRemote code execution in The Events Calendar plugin for WordPress (StellarWP) affects all versions up to and including 6
The Events Calendar WordPress plugin before 6.4.0.1 does not properly sanitize user-submitted content when rendering som
The Events Calendar WordPress plugin before 6.2.8.1 discloses the content of password protected posts to unauthenticated
Unauthenticated shortcode injection in The Events Calendar WordPress plugin before 6.17.5.1 allows remote attackers to t
The events-calendar-pro WordPress plugin before 6.4.0.1, The Events Calendar WordPress plugin before 6.4.0.1 does not pr
Remote code execution in The Events Calendar WordPress plugin (StellarWP) through version 6.17.3 lets unauthenticated at
PHP Object Injection in the WordPress plugin The Events Calendar (all versions up to and including 6.17.2) allows unauth
The The Events Calendar plugin for WordPress is vulnerable to SQL Injection via the 'order' parameter of the 'tribe_has_
Blind SQL injection in The Events Calendar WordPress plugin (versions 6.15.12 through 6.16.2) by Liquid Web / StellarWP
Integrity bypass in The Events Calendar WordPress plugin allows unauthenticated attackers to mark existing Event Aggrega
The Events Calendar WordPress plugin before 6.8.2.1 is missing access checks in the REST API, allowing for unauthenticat
The Events Calendar WordPress plugin before 6.17.3.1 exposes unpublished site content - drafts, pending posts, and priva
Same weakness CWE-502 – Deserialization of Untrusted Data
View allSame technique Deserialization
View allShare
External POC / Exploit Code
Leaving vuln.today