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Medium, CVSS 5.3amended

ApostropheCMS: CAPTCHA response token not URL-encoded

CVE-2026-113667GHSA-44qr-rrjg-2cqq

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@apostrophecms/login-recaptcha 1.2.1; @apostrophecms/login-hcaptcha 1.3.0; @apostrophecms/form 1.5.5), 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-2026-113667: 0.37% estimated exploitation activity in the next 30 days; percentile 30.47 (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 Form and login CAPTCHA verification interpolate the user-supplied widget token unencoded into the server-side verification URL/body, allowing a crafted token to inject query parameters into the reCAPTCHA/hCaptcha verify request. Details - packages/form/lib/recaptcha.js:39 — recaptchaUri = 'https://www.google.com/recaptcha/api/siteverify?secret=${recaptchaSecret}&response=${input.recaptcha}' - packages/login-recaptcha/index.js:44 — same pattern for login - packages/login-hcaptcha/index.js:47 — body: 'response=${token}&secret=${secret}' PoC Impact Low: a crafted token smuggles extra key=value pairs (secret, extra response) into the outbound verify call, forcing verification failures (DoS of the captcha gate and of captcha-gated login/form flows) and enabling automated bypass probing; no secret exfiltration. Remediation — Build the verify request with URL + searchParams (or encodeURIComponent on both secret and response), and validate the token against ^[A-Za-z0-9.-]{1,2048}$…

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

    Amended from ghsa record GHSA-44qr-rrjg-2cqq

  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-44qr-rrjg-2cqq

  4. Revision 1 · created ·

    Published from ghsa record GHSA-44qr-rrjg-2cqq

Agent brief

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

# Patch Next advisory brief: CVE-2026-113667

Advisory: ApostropheCMS: CAPTCHA response token not URL-encoded
IDs: CVE-2026-113667, GHSA-44qr-rrjg-2cqq
Record: https://patchnext.com/advisories/cve-2026-113667 (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/login-recaptcha 1.2.1; @apostrophecms/login-hcaptcha 1.3.0; @apostrophecms/form 1.5.5. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @apostrophecms/login-recaptcha: affected < 1.2.1; fixed in 1.2.1
- npm @apostrophecms/login-hcaptcha: affected < 1.3.0; fixed in 1.3.0
- npm @apostrophecms/form: affected < 1.5.5; fixed in 1.5.5

## Suggested inspection (read-only)
- `npm ls @apostrophecms/login-recaptcha --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @apostrophecms/login-hcaptcha --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @apostrophecms/form --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/login-recaptcha, @apostrophecms/login-hcaptcha, @apostrophecms/form.
- 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-44qr-rrjg-2cqq (GitHub-reviewed advisory GHSA-44qr-rrjg-2cqq lists affected ranges: npm @apostrophecms/form >=0 =0 =0 <1.3.0)
- Verified: https://osv.dev/vulnerability/GHSA-44qr-rrjg-2cqq (OSV record GHSA-44qr-rrjg-2cqq lists affected ranges: npm @apostrophecms/form >=0 =0 =0 <1.3.0 (fixed))

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