Cacti: Session Fixation via missing session_regenerate_id() after login

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Summary

CVECVE-2026-40082
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 23:17:02 UTC
Updated2026-06-29 18:50:31 UTC
DescriptionCacti 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.

Risk And Classification

Primary CVSS: v3.1 5.4 MEDIUM from [email protected]

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

EPSS: 0.001830000 probability, percentile 0.081020000 (date 2026-06-30)

Problem Types: CWE-384 | CWE-384 CWE-384: Session Fixation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
3.1CNADECLARED5.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Cacti Cacti All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cacti Cacti affected < 1.2.31 Not specified

References

ReferenceSourceLinkTags
github.com/Cacti/cacti/security/advisories/GHSA-273r-qr93-wgcp [email protected] github.com Exploit, Mitigation, Vendor Advisory
github.com/Cacti/cacti/releases/tag/release%2F1.2.31 [email protected] github.com Product, Release Notes
github.com/Cacti/cacti/commit/2fa404e70a5702be10682555911228e8e51ba198 [email protected] github.com Patch
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