CVE-2026-102785 YOOtheme · YOOtheme Pro

YOOtheme Pro - Unauthenticated Remote Code Execution via Image Handler

Vulnerability at a glance

Severity, exploitation likelihood & attack requirements

CVSS severity
Not scoredNo score in current feeds
EPSS · exploitation likelihood
Not available No score available
EPSS trend
UnavailableNo comparable history
Known exploitation
Not in KEV CISA KEV catalog Absence does not establish safety
Attack vector
Not reported
Attack complexity
Not reported
Privileges required
Not reported
User interaction
Not reported
Exploit availability & maturity
Not scored Availability not established No explicit exploit maturity assessment View exploit evidence
How to read the colors & trend
Higher exposureElevatedModerateLower exposureUnknown / unassessed

CVSS colors follow its reported severity. Attack-factor colors describe each requirement, not an overall risk rating. Gray also covers absence from KEV; absence does not establish safety.

EPSS display bands: below 1% blue, 1–10% amber, 10–50% orange, 50% and above red. These are presentation bands, not FIRST severity categories. The trend compares daily EPSS probabilities, not percentile ranks; “pp” means percentage points. The sparkline shows relative movement, with its vertical scale fitted to the observed scores.

Atomicorp ModSecurity protection

Protected by Atomicorp rules

Atomicorp ModSecurity rules block attacks exploiting this vulnerability. Keep your rules current.

5 rules identified View rules & research details →

WAF protection does not change the CVSS or EPSS score. Keep your software patched and your Atomicorp rules current.

CISA SSVC

No CISA SSVC assessment is available in the current source data.

On this page

Atomicorp protection

Rules 398127 and 398128 block exploitation attempts against the YOOtheme Pro image handler associated with CVE-2026-102785. Existing remote file inclusion rules 340162 , 340163 and 340165 block the same attack following the October 2026 Atomicorp rules update. All five are recorded here as reviewed blocking rules.

This rule association comes from an engineering review and test-target validation of the deployed protection against the request pattern reported in active attacks.

Vulnerability and exploitation context

CVE-2026-102785 affects YOOtheme Pro 5.0.0 through 5.0.52, the page builder for Joomla and WordPress. An unauthenticated remote attacker can achieve remote code execution through the theme’s image handler. The issue is described in the GitHub Advisory Database . YOOtheme fixed it in version 5.0.53, released October 21, 2026.

Members of the Joomla community report that attacks on unpatched sites began on October 21, 2026, before the fix was available. Prioritize the vendor update and check affected sites for compromise.

CVE Details

  • Protection status: Protected by Atomicorp rules · About protection statuses
  • CVE: CVE-2026-102785
  • Name: YOOtheme Pro - Unauthenticated Remote Code Execution via Image Handler
  • Severity: Critical
  • CVSS: N/A
  • CVSS version: N/A
  • CVSS source: N/A
  • CWE: N/A
  • Vendor: YOOtheme
  • Vulnerable product: YOOtheme Pro
  • Latest Update: 2026-10-22
  • Reviewed Rule IDs: 340162 , 340163 , 340165 , 398127 , 398128
  • Reviewed rules with current blocking actions: 340162 , 340163 , 340165 , 398127 , 398128
  • Request surfaces inspected: JSON request data, Request URI, Request arguments, Request filename, SOAP request data, XML request data
Technical vulnerability details · CVSS assessments, exploit evidence & CPE data

CVSS assessments

No CVSS assessment is available in the current source data. Exploitability and impact subscores describe the vulnerability’s technical characteristics. Exploit maturity describes the reported state of exploitation; these are separate measures.

Assessment source: NVD record · CVE record

Vulnerable CPE configurations

No vulnerable CPE configurations are supplied in the current NVD record. See the affected-product information and vendor guidance on this page.

  1. Maintain the reviewed Atomicorp rules. Keep your Atomicorp commercial rules current and confirm that the reviewed rules (340162 , 340163 , 340165 , 398127 , 398128 ) have not been locally disabled. Atomicorp commercial rules are enabled by default. If you use Atomic WAF, review the applicable policy and rule settings.

  2. Apply the vendor’s remediation. WAF protection is defense in depth and does not replace upgrading or following the affected vendor’s guidance. Update YOOtheme Pro to 5.0.53 or a later release on every Joomla and WordPress site that uses it, following the YOOtheme changelog . YOOtheme Pro 4 and earlier are not affected.

    Exploitation has been reported since October 21, 2026, before the fix was available. Check sites that ran an affected version for signs of compromise, including PHP files in image, cache or media directories and files changed since that date. Updating does not remove files an attacker has already placed; follow your incident response process and keep Atomicorp rules current.

  3. Validate after changes. Confirm rule updates are current, review WAF events for the affected application, and test application behavior after vendor upgrades, mitigations, or local policy changes.

Research Notes

Atomicorp WAF protections are designed around attack techniques and exploit behaviors, allowing existing protections to apply across multiple vulnerabilities without requiring a unique rule for every CVE.

Public Vulnerability References

Test or Research Source

  • Source: https://github.com/advisories/GHSA-8w8j-f6ph-29mm
  • Tags: manual-review
  • Research basis: Engineering review and test-target validation of Atomicorp rules for CVE-2026-102785. New rules 398127 and 398128 block the request pattern used to exploit the YOOtheme Pro image handler, and existing remote file inclusion rules 340162, 340163 and 340165 block the same attack following the October 2026 rules update. Validation replayed the request shape observed in active attacks, as reported by a hosting partner, against the Atomicorp test target; the rules matched every attack variant and no legitimate image handler request matched.
  • Notes: Update YOOtheme Pro to 5.0.53 or later. Exploitation has been reported in the wild since October 21, 2026.

Research Note Context

This research note documents exploit-technique analysis associated with this vulnerability and references Atomicorp WAF protections observed during engineering review, testing, or validation activities.

Atomicorp security controls are generally designed to identify and mitigate attack techniques and exploit behaviors rather than individual CVE identifiers. As a result, protections developed for one vulnerability may also apply to related attack variants and future vulnerabilities using similar techniques.

Learn More

Atomicorp develops commercially supported security technologies for web applications, servers, endpoints, workloads, and legacy enterprise platforms.

Organizations interested in protecting systems against exploit techniques associated with vulnerabilities such as this one can learn more about:

  • Atomic ModSecurity Rules: commercially maintained WAF rules for ModSecurity deployments, including protections for web attacks, bots, scanners, malware, exploitation attempts, and emerging vulnerability classes.
  • Atomic WAF: an enterprise web application firewall with Atomicorp rules, centralized management, reporting, authentication controls, and operational tooling.
  • Atomic ModSecurity Integrator: a special licensing option for MSPs, MSSPs, OEMs, VARs, reverse proxy providers, and other integrators who want to incorporate Atomicorp ModSecurity rule technology into their own products or services.
  • Atomic OSSEC: an enterprise OSSEC-based intrusion detection, compliance, and security monitoring platform.
  • Atomic Protector: workload protection for Linux, web, cloud, data center, and hybrid environments.

For additional information, product evaluations, or technical discussions, visit https://www.atomicorp.com/ or https://modsecurity.io/ .