CVE-2026-78204 GhostManager CVE debrief

Who should care

Defenders responsible for Ghostwriter deployments should assess exposure and prioritize remediation to prevent unauthorized access to report templates. This includes reviewing the current authorization settings for report template lint endpoints and implementing per-object authorization to restrict access to authenticated users. Additionally, defenders should monitor for suspicious activity on report template lint endpoints and review compensating controls

Why it matters

CVE-2026-78204 allows authenticated users to access and disclose the structure of arbitrary report templates in Ghostwriter 7.2.6, highlighting the need for defenders to verify exposure and implement per-object authorization.

• Disclosure of report template structure
• Potential for unauthorized modification of report templates
• Bypass of intended access controls
• Possible impact on data confidentiality

Technical summary

Ghostwriter 7.2.6 report template lint endpoints do not apply per-object authorization, allowing any authenticated user to lint an arbitrary template and read the returned findings, disclosing the template's structure. The vulnerability exists because RoleBasedAccessControlMixin.test_func returns only request.user.is_active unless a view overrides it, and neither the endpoint that lints a report template nor the endpoint that returns stored lint results provides an override. This allows attackers to overwrite stored lint results and disclose template structure, potentially leading to unauthorized modification of report templates and bypass of intended access controls.

Defensive priority

Defenders should prioritize verifying exposure of Ghostwriter report template lint endpoints and restricting access to authenticated users.

Recommended defensive actions

• Verify Ghostwriter report template lint endpoints exposure and restrict access to authenticated users
• Implement per-object authorization for report template lint endpoints
• Monitor for suspicious activity on report template lint endpoints
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including affected versions and exploitation. However, specific remediation steps and affected scope require verification from official sources.

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.