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CVE-2026-111367— BillionMail through 4.9 Forgeable JWTs via Default Signing Key

Quick assessment

Affected
aaPanel BillionMail
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

BillionMail 4.9 及更早版本存在硬编码加密密钥漏洞。攻击者可利用该漏洞，通过分析软件附带配置中的常量计算出密钥，从而伪造未经身份验证的退订和订阅确认 JWT 令牌。攻击者可将伪造的令牌提交至 /api/unsubscribe、/api/unsubscribe_new 或 /api/subscribe/confirm 等接口，以停用任意联系人或强制确认订阅关系。

CVSS 6.5 · Medium EPSS 0.26% · P17

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
aaPanel BillionMail ≤ 4.9 affected
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I. Basic Information for CVE-2026-111367

Vulnerability Information
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Vulnerability Title
BillionMail through 4.9 Forgeable JWTs via Default Signing Key
Source: CVE Program / CVE List V5
Vulnerability Description
BillionMail through 4.9 contains a hard-coded cryptographic key vulnerability that allows unauthenticated attackers to forge unsubscribe and subscribe-confirm JWTs by computing the key from shipped configuration constants. Attackers can submit forged tokens to /api/unsubscribe, /api/unsubscribe_new, or /api/subscribe/confirm to deactivate any contact or force confirmed subscriptions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1394
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
aaPanel BillionMail 0 ~ 4.9 -

II. Public POCs for CVE-2026-111367

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III. Intelligence Information for CVE-2026-111367

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Vendor Advisories for CVE-2026-111367 (1)

Security Blog Posts for CVE-2026-111367 (1)

Vendor Pages for CVE-2026-111367 (2)

IV. Related Vulnerabilities

Same vendor: aaPanel
Same weakness: CWE-1394

V. Comments for CVE-2026-111367

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