CVE-2026-78535 ThemeRex CVE debrief

Who should care

Defenders responsible for Photolia theme installations, version 1.0.3 or earlier, should assess exposure and prioritize remediation.

Why it matters

CVE-2026-78535 is a critical vulnerability in the Photolia theme, allowing unauthenticated PHP object injection. Defenders should prioritize verifying exposure, assessing potential exploitation, and applying remediation or compensating controls.

• Verify exposure of Photolia theme versions 1.0.3 or earlier
• Assess potential for PHP object injection exploitation
• Apply vendor remediation or compensating controls
• Monitor for potential exploitation attempts

Technical summary

The Photolia theme, version 1.0.3 or earlier, is vulnerable to unauthenticated PHP object injection. This issue has a CVSS score of 9.8 and is considered critical.

Defensive priority

Defenders should prioritize verifying exposure of Photolia theme versions 1.0.3 or earlier and applying vendor remediation.

Recommended defensive actions

• Verify Photolia theme version and check for vendor remediation
• Assess exposure and apply compensating controls if necessary
• Monitor for potential exploitation attempts

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further verification is required to determine the actual impact and affected scope.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.