EUVD-2026-64626
GHSA-hrrq-qh5p-23c2
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
SSRF inherently changes scope (S:C) as the server reaches internal systems; PR:L required for authenticated access; no availability impact applies.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
A vulnerability was determined in vas3k TaxHacker up to 0.8.2. Impacted is the function buildImapConfig of the file lib/email-sync/imap-client.ts of the component Email Sync. Executing a manipulation of the argument host/port can lead to server-side request forgery. It is possible to launch the attack remotely. The pull request to fix this issue awaits acceptance.
AnalysisAI
Server-side request forgery in vas3k TaxHacker up to version 0.8.2 enables authenticated remote attackers to force the application server to initiate arbitrary IMAP TCP connections to attacker-controlled hosts and ports via the Email Sync configuration interface. The buildImapConfig function in lib/email-sync/imap-client.ts accepted unsanitized host and port parameters with no allowlist validation, no private-IP blocking, and no port restriction, allowing the TaxHacker server process to be redirected as a proxy into the internal network. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid authenticated user account on the TaxHacker instance with access to the Email Sync configuration interface (CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The reported CVSS 4.0 score of 5.3 (Medium) with vector AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N reflects network-accessible exploitation at low complexity but requiring authentication (PR:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated TaxHacker user submits an IMAP server configuration via the Email Sync settings page, setting `host` to an internal address such as 192.168.1.100 or 169.254.169.254 (AWS metadata endpoint) and `port` to a target service port such as 6379 (Redis), 22 (SSH), or 80 (internal HTTP). The server's `addEmailServerAction` passes these values unvalidated into `buildImapConfig` and calls `imaps.connect()`, directing a server-side TCP connection to the internal target. … |
| Remediation | No released patched version is confirmed at time of analysis - the fix exists solely as unmerged GitHub PR #170 (https://github.com/vas3k/TaxHacker/pull/170). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-918 – Server-Side Request Forgery (SSRF)
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External POC / Exploit Code
Leaving vuln.today