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CVE-2026-80349— TarsWeb through 3.0.14 Authentication Bypass via Spoofed X-Forwarded-For and uid Parameter

Quick assessment

Affected
TarsCloud TarsWeb
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.

TarsWeb 依赖由客户端控制的 HTTP 头来判断请求是否来自可信的本地调用者。在 中，Koa 的 选项被设置为 ，但未指定哪些上游代理是可信的，也未限制转发跳数。因此，Koa 报告的请求地址取自攻击者提供的 头。 在 中，存在一个代码分支同时处理忽略路径列表（ignored-path list）和来自 的 IP 白名单（ignoreIps allowlist）。该配置中包含了回环地址（loopback address，如 127.0.0.1）。在此分支中，系统直接从查询参数 中分配有效的账户身份，而在跳转至后

CVSS 9.8 · Critical

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
TarsCloud TarsWeb ≤ 3.0.14 affected
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I. Basic Information for CVE-2026-80349

Vulnerability Information
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Vulnerability Title
TarsWeb through 3.0.14 Authentication Bypass via Spoofed X-Forwarded-For and uid Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
TarsWeb decides whether a request comes from a trusted local caller using a client-controlled header. app.js sets Koa's proxy option to true without naming which upstream proxies may be trusted and without limiting the number of forwarded hops, so the request address Koa reports is taken from the X-Forwarded-For header supplied by the caller. In midware/ssoMidware.js a single branch covers both the ignored-path list and the ignoreIps allowlist from config/loginConf.js, which contains the loopback address, and that branch assigns the effective account identity from the uid query parameter before falling through to the request without validating any ticket, cookie or password. A request carrying a forged X-Forwarded-For value naming the loopback address and a uid naming an existing account therefore reaches every route the console mounts as that account, including an administrator, with no credential of any kind. Those routes include user and role administration, service configuration, and package upload and deployment. Version 3.0.16 separates the two branches so that a match on the address allowlist assigns the configured default account rather than one named by the caller.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
TarsCloud TarsWeb 0 ~ 3.0.14 -

II. Public POCs for CVE-2026-80349

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III. Intelligence Information for CVE-2026-80349

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Other References for CVE-2026-80349 (4)

IV. Related Vulnerabilities

Same product: TarsWeb
Same vendor: TarsCloud
Same weakness: CWE-290

V. Comments for CVE-2026-80349

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