CVE-2026-78061 vas3k CVE debrief

Who should care

Defenders responsible for vas3k TaxHacker deployments should assess exposure and prioritize verification of the version in use. This includes operators, platform administrators, vulnerability management teams, and security teams who need to ensure that the vulnerable component is properly secured or patched. Additionally, defenders should review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

Defenders should prioritize verifying the version of vas3k TaxHacker in use and assessing exposure to the vulnerable component to prevent potential server-side request forgery attacks.

• Potential for remote server-side request forgery attacks
• Need to verify version of vas3k TaxHacker in use
• Possible impact on email sync functionality

Technical summary

The function buildImapConfig of the file lib/email-sync/imap-client.ts in vas3k TaxHacker up to 0.8.2 is vulnerable to server-side request forgery due to manipulation of the argument host/port. This vulnerability allows remote attackers to potentially manipulate server-side requests, which could lead to unauthorized actions or data breaches. The vulnerability is located in the Email Sync component, and defenders should prioritize verifying the version of vas3k TaxHacker in use and assessing exposure to the vulnerable component.

Defensive priority

Defenders should prioritize verifying the version of vas3k TaxHacker in use and assessing exposure to the vulnerable component.

Recommended defensive actions

• Verify the version of vas3k TaxHacker in use
• Assess exposure to the vulnerable component
• Monitor for remote attacks
• Consider compensating controls
• Review vendor guidance for patching or mitigation
• Perform an inventory of affected assets
• Track exceptions and retest remediated assets

Evidence notes

The CVE record and source metadata indicate a vulnerability in vas3k TaxHacker up to 0.8.2, but details on affected versions and remediation are limited. Defenders should verify the version in use and assess exposure to the vulnerable component. Evidence is limited, and further verification is required to confirm the scope of the vulnerability and potential impact.

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.