# CVE-2026-97283: StellarWP Advanced Post Manager PHP object injection

Source: https://junglewise.ai/threats/cve-2026-97283-deserialization-of-untrusted-data-vulnerability-in-liquid-web  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-05. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-97283 · Severity: critical · CVSS 9.8 · Published 2026-10-05

Advanced Post Manager is a WordPress plugin that manages content publishing workflows. A PHP object injection vulnerability allows authenticated attackers with contributor-level privileges to execute arbitrary code on the website server, potentially leading to complete site compromise and data theft.

Vendors: [StellarWP](https://junglewise.ai/threats/vendors/stellarwp).

## Quick answers

**Is CVE-2026-97283 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-97283 being exploited in the wild.

**How severe is CVE-2026-97283?** Critical severity, with a CVSS score of 9.8, published 5 October 2026.

**Which products and versions are affected?** StellarWP Advanced Post Manager through 4.5.5.

**Is there a fix for CVE-2026-97283?** Yes: fixed in 4.5.6. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-97283 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-97283?** Check whether you run StellarWP Advanced Post Manager 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.

## How to fix

- Fixed in 4.5.6

## Technical details

The plugin improperly deserializes untrusted user-supplied data, allowing object injection attacks. An authenticated attacker with contributor privileges can craft malicious serialized objects to trigger arbitrary code execution on the server. A patch is available in version 4.5.6.

## Affected products

- StellarWP Advanced Post Manager through 4.5.5

## Timeline

- 2026-10-05: disclosed
- 2026-10-03: patched

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/wordpress/plugin/advanced-post-manager/vulnerability/wordpress-advanced-post-manager-plugin-4-5-5-php-object-injection-vulnerability?_s_id=cve](https://patchstack.com/database/wordpress/plugin/advanced-post-manager/vulnerability/wordpress-advanced-post-manager-plugin-4-5-5-php-object-injection-vulnerability?_s_id=cve)

## Related threats

- [StellarWP Advanced Post Manager missing authorization](https://junglewise.ai/threats/cve-2026-111396-missing-authorization-vulnerability-in-liquid-web-stellarwp)