CVE-2026-104469: YesWiki session fixation in login

CVE-2026-104469 · Severity: medium · CVSS 6.8 · Published 2026-10-02

YesWiki is a collaborative wiki platform that stores user sessions via PHP cookies. The login process fails to rotate the session ID after authentication, allowing attackers who know or set a victim's session cookie before login to reuse it afterward and hijack the authenticated account. An attacker can then access private pages and perform administrative actions as the victim.

Technologies: YesWiki. Vendors: YesWiki.

Quick answers

Is CVE-2026-104469 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-104469 being exploited in the wild.
How severe is CVE-2026-104469?
Medium severity, with a CVSS score of 6.8, published 2 October 2026.
Which products and versions are affected?
YesWiki before 4.6.7.
Is there a fix for CVE-2026-104469?
Yes: fixed in 4.6.7. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-104469 attacked?
It is attacked over the network.
Am I affected by CVE-2026-104469?
Check whether you run YesWiki at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Fixed in: 4.6.7

Technical details

YesWiki starts a PHP session before authentication and stores the authenticated user in the existing session during login without calling session_regenerate_id(). An attacker who can set or learn a victim's pre-authentication YesWiki-* cookie can reuse the same session ID after the victim logs in. Attack vectors include subdomain cookie tossing, shared/local browser access, or other session injection primitives, requiring user interaction (the victim must log in).

Affected products

  • YesWiki YesWiki before 4.6.7

Timeline

  • 2026-09-01: disclosed
  • 2026-10-02: advisory

References

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