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Response snapshot Oct 27, 2026, 00:06 UTC

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VulnerabilityCVE-2026-113669

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

**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.

At a glance

Exploited
Not known
Severity
5.3 Medium (CVSS 4.0)
Chance of exploitation
0.4% in the next 30 days
Sources
1 source

What to do

GitHub lists first patched versions: apostrophe: 4.33.0; @apostrophecms/passport-bridge: 1.6.1. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-hhvr-8m24-qqr3 (opens a new tab)

What happened

**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.assign`s 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 `APOS_LOG_ALL_ROUTES=1`.

**PoC** ``` # 0) Anonymous baseline: admin-only draft → 403 # 1) Admin logs in legitimately (token minted into redirect URL): curl -c admin.cookies -X POST -H "Content-Type: application/json" \ --data '{"username":"admin","password":"adminpassword","session":true}' \ http://localhost:3100/api/v1/@apostrophecms/login/login # 2) Attacker with NO credentials visits the leaked token URL: curl -c atk.

Continue reading

cookies "http://localhost:3100/?aposCrossDomainSessionToken=HUNTING_TOKEN" # → 302 Location: / ; attacker now holds a vulnlab.sid SID cookie # 3) Attacker reads admin-only content via adopted session: curl -b atk.cookies "...

/api/v1/@apostrophecms/page/d576242ve1dkzb12jiiabujd:en:draft" # → 200 adopted-session read -> Secret Private Page | secretData = TOP-SECRET-VALUE-abc123 # 4) Cache entry consumed (single-use): {"value":null} ```

**Impact** Session hijack / account takeover of the migrated user for anyone who obtains the token, inheriting all the account's privileges. Exposure is realistic precisely because the token is in URLs: server/proxy/browser-access logs, browser history, and the Referer header when the destination host differs from the source (the intended use case). Single-use limits but does not remove the window.

**Remediation** — Deliver the token via a short-lived HttpOnly signed SameSite cookie rather than a query parameter; bind consumption to the exact source/destination host pair, expire in seconds, and never log it.

Affected package ranges reported by GitHub: apostrophe: < 4.33.0 @apostrophecms/passport-bridge: < 1.6.1

Scores and how they were measured

CVSS base severity

5.3

Version 4.0As of

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

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

0.4%

Scored Percentile 35.7%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-hhvr-8m24-qqr3 (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-hhvr-8m24-qqr3, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  3. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-hhvr-8m24-qqr3, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  4. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-hhvr-8m24-qqr3, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  5. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-113669, scored 2026-10-26. This is a model estimate, not proof of exposure.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 20). ApostropheCMS: Cross-domain session token in URL confers session takeover (CVE-2026-113669). https://kevwire.com/record/CVE-2026-113669

MLA

"ApostropheCMS: Cross-domain session token in URL confers session takeover (CVE-2026-113669)." KEVWire, 20 Oct. 2026, kevwire.com/record/CVE-2026-113669.

Chicago

KEVWire. "ApostropheCMS: Cross-domain session token in URL confers session takeover (CVE-2026-113669)." Last modified October 20, 2026. https://kevwire.com/record/CVE-2026-113669.

Evidence summary (plain text)

ApostropheCMS: Cross-domain session token in URL confers session takeover (Oct 20, 2026).
**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.assign`s 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 `APOS_LOG_ALL_ROUTES=1`.
CVSS 5.3 (version 4.0; evidence as of Oct 20, 2026; https://github.com/advisories/GHSA-hhvr-8m24-qqr3).
EPSS 0.4% for the following 30 days, scored Oct 26, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-113669&date=2026-10-26).
Sources:
GitHub-reviewed advisory GHSA-hhvr-8m24-qqr3: https://github.com/advisories/GHSA-hhvr-8m24-qqr3
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yMVQyMDo0NTowN1rOAAfvzQ%3D%3D
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yMVQyMDozMDoyNlrOAAfvxw%3D%3D
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yMVQyMDowMzo1N1rOAAfvxQ%3D%3D
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-113669&date=2026-10-26
Record ID: CVE-2026-113669.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 26, 2026, 19:40 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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