CVE-2026-40080 Details
Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior are vulnerable to Open Redirect through a substring check rather than a host check at str_contains($referer, CACTI_PATH_URL). When the user's login_opts == '1' (redirect to referer after login), the function used $_SERVER['HTTP_REFERER'] directly. An attacker could craft a referer such as https://evil.com/cacti/. Where CACTI_PATH_URL is /cacti/, the substring matches and the user is redirected to evil.com after login. The pre-existing validate_redirect_url() helper at lib/html_utility.php performed proper validation but was not invoked from auth_login_redirect(). This issue has been fixed in version 1.2.31.
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Exploit prediction scoring system (EPSS) score for CVE-2026-40080
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
0.15 Probability of exploitation activity being observed over the next 30 days (5th percentile)
CVSS score for CVE-2026-40080
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
6.1 Medium
Products affected by CVE-2026-40080
Cacti 1.0.1
Cacti 1.0.3
Cacti 1.0.4
Cacti 1.1.10
Cacti 1.1.12
DVE Score by Bitsight AI
DVE scores complement traditional static scoring systems like CVSS with Bitsight AI powered real-time threat intelligence and underground cyber criminal activity so that security teams can reduce alert fatigue and focus on vulnerabilities most likely to be exploited.
Low
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CVE-2026-40080 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
ID 146 30.87%
US 36 7.61%
NP 25 5.29%
BD 18 3.81%
UA 15 3.17%
IN 14 2.96%
RU 12 2.54%
AR 11 2.33%
GB 11 2.33%
PK 11 2.33%

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CVE-2026-40080 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Technology 50 50.51%
Telecommunications 41 41.41%
Education 5 5.05%
Nonprofit/NGO 1 1.01%
Insurance 1 1.01%
Government/Politics 1 1.01%

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