Element Web/Element Desktop up to 1.12.31 Guest Session loadSession guest_user_id/guest_access_token improper authentication

Summaryinfo

A vulnerability, which was classified as problematic, was found in Element Web and Element Desktop up to 1.12.31. Affected is the function loadSession of the component Guest Session Handler. Such manipulation of the argument guest_user_id/guest_access_token leads to improper authentication. This vulnerability is uniquely identified as CVE-2026-119407. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Element Web and Element Desktop up to 1.12.31. Affected by this issue is the function loadSession of the component Guest Session Handler. The manipulation of the argument guest_user_id/guest_access_token with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is integrity, and availability. CVE summarizes:

Element Web and Element Desktop before 1.12.32 accept guest credentials from URL fragment parameters in loadSession, allowing remote unauthenticated attackers to log out users and clear local stores. Attackers can lure logged-in users into opening links with guest_user_id and guest_access_token to force an attacker-controlled guest session and destroy unbacked end-to-end encryption keys.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-119407 since 10/30/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 1.12.32 eliminates this vulnerability.

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Productinfo

Vendor

• Element

Name

• Element Desktop
• Web

Version

• 1.12.0
• 1.12.1
• 1.12.2
• 1.12.3
• 1.12.4
• 1.12.5
• 1.12.6
• 1.12.7
• 1.12.8
• 1.12.9
• 1.12.10
• 1.12.11
• 1.12.12
• 1.12.13
• 1.12.14
• 1.12.15
• 1.12.16
• 1.12.17
• 1.12.18
• 1.12.19
• 1.12.20
• 1.12.21
• 1.12.22
• 1.12.23
• 1.12.24
• 1.12.25
• 1.12.26
• 1.12.27
• 1.12.28
• 1.12.29
• 1.12.30
• 1.12.31

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