CVE-2026-40082

Description

Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior have missing session_regenerate_id() after login, leading to Session Fixation. session_regenerate_id() is NOT called after successful login. The login flow at auth_login.php:203-207 directly sets $_SESSION[SESS_USER_ID] without rotating the session ID. The session cookie configuration is otherwise good (httponly=true, samesite=Strict, secure=true for HTTPS at include/global.php:513-537), but these do not prevent session fixation via same-site vectors. This issue has been fixed in version 1.2.31.

CVSS v3.1 Score

5.4

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0018

Probability of exploitation

0.08%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-384 CWE-384

Affected Products

Vendor	Product	Versions
cacti	cacti	< 1.2.31

References

Advisories & Patches

https://github.com/Cacti/cacti/commit/2fa404e70a5702be10682555911228e8e51ba198 https://github.com/Cacti/cacti/security/advisories/GHSA-273r-qr93-wgcp

Exploits

https://github.com/Cacti/cacti/security/advisories/GHSA-273r-qr93-wgcp

Other References

https://github.com/Cacti/cacti/releases/tag/release%2F1.2.31

Frequently Asked Questions

What is CVE-2026-40082? +

Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior have missing session_regenerate_id() after login, leading to Session Fixation. session_regenerate_id() is NOT called after successful login. The login flow at auth_login.php:203-207 directly sets $_SESSION[SESS_USER_ID] without rotating the session ID. The session cookie configuration is otherwise good (httponly=true, samesite=Strict, secure=true for HTTPS at include/global.php:513-537), but these do not prevent session fixation via same-site vectors. This issue has been fixed in version 1.2.31. It has a CVSS v3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2026-40082? +

CVE-2026-40082 has a CVSS v3.1 score of 5.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0018, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-40082? +

CVE-2026-40082 affects products from cacti, specifically: cacti. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-40082? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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