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.
Fix
Patch, vendor advisory and mitigation references on NVD 1
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.1 · element-hqNVD modified 2026-10-30 11:30
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 7
- https://github.com/element-hq/element-web/security/advisories/GHSA-c88w-7h6p-27xr vendor-advisory
- https://github.com/element-hq/element-web/commit/792453c88a399d570599f5d73b08b40157cd80c0 patch
- https://github.com/element-hq/element-web/blob/v1.12.31/apps/web/src/Lifecycle.ts#L188 technical-description
- https://github.com/element-hq/element-web/releases/tag/v1.12.32 release-notes
- https://abraxaslabs.tech/research/element-fragment-guest third-party-advisory
- https://github.com/element-hq/element-web product
- https://www.vulncheck.com/advisories/element-web-and-element-desktop-before-1.12.32-forced-logout-via-guest-credential-url-parameters third-party-advisory