Element Call reports full URLs of visited pages to analytics server

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

8.6 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2026-48007: 0.25% estimated exploitation activity in the next 30 days; percentile 17.03 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact Element Call versions 0.5.17 through 0.19.3 report analytics data to a PostHog server, when configured to by a posthog key in config.json or by the posthogApiHost and posthogApiKey URL parameters. Several fields of this data ($initialpersoninfo, $sessionentryurl, and $currenturl) were found to contain the full URL of the user's visited page, including the fragment. Users of a standalone Element Call ‘SPA’ instance such as https://call.element.io may therefore have reported the full URLs of certain calls, including encryption passwords, to the configured PostHog server, potentially compromising the confidentiality of the calls to actors who could access both the PostHog analytics data and the encrypted media streams. The same issue is present in Element Call's embedded package, but in practice it does not impact applications using this package (including Element Web, Element Desktop, Element X iOS, and Element X Android) because they distribute encryption keys over Matrix…

Published by the source

11 Jun 2026, 13:26 UTC

Last modified by the source

10 Sep 2026, 03:51 UTC

Source last checked

26 Oct 2026, 12:55 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-6vhh-4xw6-h2h2

2. Revision 2 · amended · 24 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-6vhh-4xw6-h2h2

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-48007

Advisory: Element Call reports full URLs of visited pages to analytics server
IDs: CVE-2026-48007, GHSA-6vhh-4xw6-h2h2
Record: https://patchnext.com/advisories/cve-2026-48007 (revision 3, source checked 26 Oct 2026, 12:55 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @element-hq/element-call-embedded 0.19.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @element-hq/element-call-embedded: affected >= 0.5.17, <= 0.19.3; fixed in 0.19.4

## Suggested inspection (read-only)
- `npm ls @element-hq/element-call-embedded --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @element-hq/element-call-embedded.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-6vhh-4xw6-h2h2 (OSV record GHSA-6vhh-4xw6-h2h2 lists affected ranges: npm @element-hq/element-call-embedded >=0.5.17 <0.19.4 (fixed))
- Verified: https://github.com/advisories/GHSA-6vhh-4xw6-h2h2 (GitHub-reviewed advisory GHSA-6vhh-4xw6-h2h2 lists affected ranges: npm @element-hq/element-call-embedded >=0.5.17 <=0.19.3)

Commands are suggestions: review each one before running it.