How severe is CVE-2026-40082?

CVE-2026-40082 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-40082 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40082?

CVE-2026-40082 affects Cacti. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40082?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-40082 have an EU (EUVD) identifier?

Yes. CVE-2026-40082 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39586.

When was CVE-2026-40082 published?

CVE-2026-40082 was published on 2026-06-25 and last updated on 2026-06-29.

CVE-2026-40082

CVE-2026-40082 is a medium-severity vulnerability in Cacti with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-384.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39586
Weakness: CWE-384
Affected product: Cacti
Published: 2026-06-25
Last modified: 2026-06-29

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.

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.
How severe is CVE-2026-40082?: CVE-2026-40082 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-40082 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40082?: CVE-2026-40082 affects Cacti. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40082?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-40082 have an EU (EUVD) identifier?: Yes. CVE-2026-40082 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39586.
When was CVE-2026-40082 published?: CVE-2026-40082 was published on 2026-06-25 and last updated on 2026-06-29.

References

Affected products (1)

cpe:2.3:a:cacti:cacti:*:*:*:*:*:*:*:*

More vulnerabilities in Cacti

CVE-2026-40079 — Critical (CVSS 9.8): Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior are vulnerable to Command…
CVE-2026-39955 — Critical (CVSS 9.8): Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior have pre-authentication…
CVE-2026-39948 — Critical (CVSS 9.8): Cacti is an open source performance and fault management framework. In versions 1.2.30 and prior, the rfilter request…
CVE-2026-39938 — Critical (CVSS 9.8): Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior have unauthenticated LFI…
CVE-2026-39893 — Critical (CVSS 9.8): Cacti is an open source performance and fault management framework. In versions 1.2.30 and prior, the rfilter request…
CVE-2023-39361 — Critical (CVSS 9.8): Cacti is an open source operational monitoring and fault management framework. Affected versions are subject to a SQL…

All CVEs affecting Cacti →

Other CWE-384 (Session Fixation) vulnerabilities

CVE-2024-11317 — Critical (CVSS 10.0): Session Fixation vulnerabilities allow an attacker to fix a users session identifier before login providing an…
CVE-2024-38513 — Critical (CVSS 10.0): Fiber is an Express-inspired web framework written in Go A vulnerability present in versions prior to 2.52.5 is a…
CVE-2021-20151 — Critical (CVSS 10.0): Trendnet AC2600 TEW-827DRU version 2.08B01 contains a flaw in the session management for the device. The router's…
CVE-2025-67446 — Critical (CVSS 9.8): Improper Authentication (Authentication Bypass) exists in Neterbit NW-431F Router 20241014-IR03 and before. The router…
CVE-2026-25101 — Critical (CVSS 9.8): Bludit allows user's session identifier to be set before authentication. The value of this session ID stays the same…
CVE-2026-24352 — Critical (CVSS 9.8): PluXml CMS allows a user's session identifier to be set before authentication. The value of this session ID stays the…

Browse all CWE-384 (Session Fixation) vulnerabilities →