CVE-2026-40080Public exploitNetwork attack vector

Open redirect via HTTP_REFERER substring check

Published Jun 25, 2026 · Updated Jun 25, 2026

Open redirect in Cacti 1.2.30 and earlier allows remote attackers to send users to an external site after successful login. auth_login_redirect() accepts $_SERVER['HTTP_REFERER'] when login_opts is 1 and tests only whether it contains CACTI_PATH_URL, so an attacker-controlled host containing that path passes validation. Exploitation requires tricking a user configured to redirect to the referrer into visiting the login flow and completing authentication; the resulting redirect can support phishing.

CVSS severity6.1
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in Cacti 1.2.30 and earlier allows remote attackers to send users to an external site after successful login. auth_login_redirect() accepts $_SERVER['HTTP_REFERER'] when login_opts is 1 and tests only whether it contains CACTI_PATH_URL, so an attacker-controlled host containing that path passes validation. Exploitation requires tricking a user configured to redirect to the referrer into visiting the login flow and completing authentication; the resulting redirect can support phishing.

The record

CVE
CVE-2026-40080
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Cacti Group
Product
Cacti
Classifications
CWE-601, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=< 1.2.31

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Cacti Group · Cactiversion=< 1.2.31

Published CVSS scores

6.1GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A: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.

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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-601URL Redirection to Untrusted Site ('Open Redirect')
T1204.001Malicious Link

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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