CVE-2026-78062Public exploitNetwork attack vector

Unauthenticated account impersonation via default JWT secret

Published Aug 23, 2026 · Updated Aug 23, 2026

Authentication bypass in vas3k TaxHacker 0.8.0 through 0.8.2 allows remote attackers to forge JWT session tokens. The BETTER_AUTH_SECRET schema in lib/config.ts assigns a public default when the variable is unset, and config.auth.secret passes it to better-auth for JWT signing. Exploitation requires a deployment without an explicit secret and knowledge of a user ID; forged tokens grant access as that user to protected financial data and actions.

CVSS severityUnavailable
Unscored
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in vas3k TaxHacker 0.8.0 through 0.8.2 allows remote attackers to forge JWT session tokens. The BETTER_AUTH_SECRET schema in lib/config.ts assigns a public default when the variable is unset, and config.auth.secret passes it to better-auth for JWT signing. Exploitation requires a deployment without an explicit secret and knowledge of a user ID; forged tokens grant access as that user to protected financial data and actions.

The record

CVE
CVE-2026-78062
Published
Aug 23, 2026
Updated
Aug 23, 2026
Vendor
vas3k
Product
TaxHacker
Classifications
CWE-798, CWE-259, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.8.0
  2. Affected versionversion=0.8.1
  3. Affected versionversion=0.8.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

vas3k · TaxHackerversion=0.8.0; version=0.8.1; version=0.8.2

Published CVSS scores

7.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
6.9VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.3VulDB CNACVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
7.5VulDB CNAAV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
CWE-259Use of Hard-coded Password
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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