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Medium, CVSS 5.3amended

ApostropheCMS: Cross-domain session token in URL confers session takeover

CVE-2026-113669GHSA-hhvr-8m24-qqr3

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@apostrophecms/passport-bridge 1.6.1; apostrophe 4.33.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2026-113669: 0.42% estimated exploitation activity in the next 30 days; percentile 35.99 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary Apostrophe's cross-domain session migration emits a single-use session token as a URL query parameter and stores it in the Mongo cache. Any client that presents the token silently adopts the target user's full session (including passport.user) with no credentials. Details packages/apostrophe/modules/@apostrophecms/i18n/index.js: - Token generation on cross-host/locale flows (L479–487) and passport-bridge cross-locale redirect (passport-bridge/index.js L557–593) places the token in the URL. - acceptCrossDomainSessionToken (L258–298) reads ?aposCrossDomainSessionToken, Object.assigns the stored session (cookie + passport.user) onto req.session, then nulls the cache entry under namespace @apostrophecms/i18n:cross-domain-sessions. - Middleware without before: is registered for every URL (express findModuleMiddlewareAndRoutes L820–879); verified with APOSLOGALLROUTES=1. PoC Impact Session hijack / account takeover of the migrated user for anyone who obtains the token, inheriting…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 4 · amended ·

    Amended from ghsa record GHSA-hhvr-8m24-qqr3

  2. Revision 3 · amended ·

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

  3. Revision 2 · amended ·

    Amended from osv record GHSA-hhvr-8m24-qqr3

  4. Revision 1 · created ·

    Published from ghsa record GHSA-hhvr-8m24-qqr3

Agent brief

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# Patch Next advisory brief: CVE-2026-113669

Advisory: ApostropheCMS: Cross-domain session token in URL confers session takeover
IDs: CVE-2026-113669, GHSA-hhvr-8m24-qqr3
Record: https://patchnext.com/advisories/cve-2026-113669 (revision 4, source checked 26 Oct 2026, 13:07 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @apostrophecms/passport-bridge 1.6.1; apostrophe 4.33.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @apostrophecms/passport-bridge: affected < 1.6.1; fixed in 1.6.1
- npm apostrophe: affected < 4.33.0; fixed in 4.33.0

## Suggested inspection (read-only)
- `npm ls @apostrophecms/passport-bridge --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls apostrophe --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 @apostrophecms/passport-bridge, apostrophe.
- 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://github.com/advisories/GHSA-hhvr-8m24-qqr3 (GitHub-reviewed advisory GHSA-hhvr-8m24-qqr3 lists affected ranges: npm apostrophe >=0 =0 <1.6.1)
- Verified: https://osv.dev/vulnerability/GHSA-hhvr-8m24-qqr3 (OSV record GHSA-hhvr-8m24-qqr3 lists affected ranges: npm apostrophe >=0 =0 <1.6.1 (fixed))

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