Quick answers
- Is CVE-2026-39471 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-39471 being exploited in the wild.
- How severe is CVE-2026-39471?
- High severity, with a CVSS score of 7.2, published 15 June 2026.
- Which products and versions are affected?
- ShortPixel Image Optimizer <= 6.4.3.
- Is there a fix for CVE-2026-39471?
- A patch was published on 2026-04-20: Version 6.4.4 released to address the issue Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-39471 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-39471?
- Check whether you run ShortPixel Image Optimizer 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 ShortPixel Image Optimizer plugin for WordPress is vulnerable to PHP Object Injection (CWE-502) in versions up to 6.4.3. This occurs due to the deserialization of untrusted input provided by a user with Author-level privileges. An attacker can exploit this by submitting specially crafted input that, when processed by the PHP unserialize() function, can trigger a POP (Property Oriented Programming) chain. Depending on the available classes within the environment, this can lead to remote code execution, file manipulation, or unauthorized database access. The vulnerability is patched in version 6.4.4.
Affected products
- ShortPixel ShortPixel Image Optimizer <= 6.4.3
Timeline
- 2026-02-25: other: Vulnerability reported by researcher daroo
- 2026-04-20: advisory: Initial advisory published by Patchstack
- 2026-06-15: disclosed: NVD publication date
- 2026-04-20: patched: Version 6.4.4 released to address the issue