CVE-2026-49226 givanz CVE debrief

Who should care

Defenders responsible for Vvveb CMS installations, particularly those with low-privileged Author accounts, should assess exposure to this vulnerability and take necessary actions to prevent unauthorized access.

Why it matters

Defenders should prioritize verifying exposure of Vvveb CMS installations to this vulnerability and take necessary actions to prevent unauthorized access, as low-privileged Authors can access posts owned by another Author prior to version 1.0.8.4.

• Potential exposure of private drafts
• Content pollution or data loss due to unauthorized post modifications
• Business disruption resulting from unauthorized post access or modifications
• Verification of Vvveb CMS installations for exposure to this vulnerability

Technical summary

The Vvveb CMS backend post operations allow a low-privileged Author to access posts owned by another Author prior to version 1.0.8.4. This is due to the admin/controller/content/posts.php controller permitting filter[admin_id] to replace the server-selected admin_id restriction and accepting a caller-controlled post_id for duplicate and delete actions. The admin/sql/sqlite/post.sql does not consistently enforce post.admin_id, leading to potential unauthorized access and modifications of posts, which can result in exposure of private drafts, content pollution, data loss, or business disruption.

Defensive priority

Defenders should prioritize verifying exposure of Vvveb CMS installations to this vulnerability and upgrading to version 1.0.8.4 or later.

Recommended defensive actions

• Verify Vvveb CMS installations for exposure to this vulnerability
• Upgrade to version 1.0.8.4 or later
• Monitor for unauthorized post metadata access or modifications
• 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 its description, CVSS score, and affected versions. Evidence is limited to public CVE and NVD information. Defenders should verify Vvveb CMS installations for exposure, focusing on low-privileged Author accounts and post operations. The official CVE Program record (CVE-2026-49226) and NVD detail page offer source-specific vulnerability assessments. Additional source references may be necessary for comprehensive exposure assessment.

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.