Quick answers
- Is CVE-2026-78265 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-78265 being exploited in the wild.
- How severe is CVE-2026-78265?
- Critical severity, with a CVSS score of 9.8, published 24 August 2026.
- Which products and versions are affected?
- StellarWP The Events Calendar <= 6.17.2.
- Is there a fix for CVE-2026-78265?
- A patch was published on 2026-08-24: Fix available in version 6.17.3 or later Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-78265 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-78265?
- Check whether you run StellarWP The Events Calendar at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a PHP object injection (CWE-502: Deserialization of Untrusted Data) in The Events Calendar plugin versions up to 6.17.2. The flaw allows unauthenticated attackers to craft malicious input that is deserialized by the plugin, enabling arbitrary code execution on the server. No authentication is required to exploit this vulnerability, and the attack vector is network-based. A fix is available in version 6.17.3 and later.
Affected products
- StellarWP The Events Calendar <= 6.17.2
Timeline
- 2026-08-24: disclosed: Public disclosure via NVD
- 2026-08-24: patched: Fix available in version 6.17.3 or later