CVE-2026-80349Public exploitNetwork attack vectorHinoki check available

Unauthenticated administrator impersonation via spoofed forwarding headers

Published Aug 26, 2026 · Updated Aug 26, 2026

Authentication bypass in TarsCloud TarsWeb 3.0.14 and earlier allows remote attackers to impersonate administrators over HTTP. app.js makes Koa accept caller-supplied X-Forwarded-For as ctx.ip, and ssoMidware.js assigns ctx.uid from the uid query parameter when that address matches loopback. Network access to the HTTP service is sufficient; the request needs no credentials and gains the named account's console permissions, including administrative control.

CVSS severity9.3
Critical
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authentication bypass in TarsCloud TarsWeb 3.0.14 and earlier allows remote attackers to impersonate administrators over HTTP. app.js makes Koa accept caller-supplied X-Forwarded-For as ctx.ip, and ssoMidware.js assigns ctx.uid from the uid query parameter when that address matches loopback. Network access to the HTTP service is sufficient; the request needs no credentials and gains the named account's console permissions, including administrative control.

The record

CVE
CVE-2026-80349
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
TarsCloud
Product
TarsWeb
Classifications
CWE-290, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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 <=3.0.14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TarsCloud · TarsWebversion=0 <=3.0.14

Published CVSS scores

9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
T1190Exploit Public-Facing Application

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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