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VulnerabilityPublished

CVE-2026-24352: PluXml CMS · Session Fixation

Affects PluXml CMSSource CVE Database V5

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Not known to be exploited · CVSS 4.8 Medium.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 4.0 base score
4.8Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 32% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 Feb 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
PluXmlPluXml CMSAffected
  • =5.9.0-rc7
  • =5.8.21
Fixed in–
Packagistpluxml/pluxml-cmspkg:composer/pluxml/pluxml-cmsOther threatsAffected
  • =5.8.21
  • =5.9.0-rc7
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

  1. Immediately upgrade PluXml CMS to a version that addresses this vulnerability once an official patch is released.
  2. Until patches are available, implement server-side session management controls to forcibly regenerate session IDs upon successful authentication, ensuring old session IDs are invalidated.
  3. Configure web application firewalls (WAFs) to detect and block suspicious session fixation attempts, such as session IDs supplied via URL parameters or cookies before login.
  4. Educate users and administrators about the risks of session fixation and encourage cautious behavior regarding session identifiers, especially avoiding clicking on suspicious links.
  5. Employ additional authentication mechanisms such as multi-factor authentication (MFA) to reduce the impact of session hijacking.
  6. Monitor logs for unusual session activity or repeated session ID reuse patterns.
  7. Review and harden session cookie attributes (e.g., HttpOnly, Secure, SameSite) to reduce session theft risks.
  8. Conduct a thorough audit of all PluXml CMS instances to identify and remediate vulnerable versions.
  9. Consider isolating critical CMS functions behind VPNs or IP whitelisting to reduce exposure. These measures go beyond generic advice by focusing on session regeneration, WAF tuning, and user education specific to session fixation.

Description

PluXml CMS allows a user's session identifier to be set before authentication. The value of this session ID stays the same after authentication. This behaviour enables an attacker to fix a session ID for a victim and later hijack the authenticated session. The vendor was notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Only versions 5.8.21 and 5.9.0-rc7 were tested and confirmed as vulnerable, other versions were not tested and might also be vulnerable.

References

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