What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-20 · updated 2026-10-21
• Weakness: CWE-116

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.

Affected products

• apostrophecms apostrophe: before 4.33.0
• @apostrophecms form: before 1.5.5
• @apostrophecms login-hcaptcha: before 1.3.0
• @apostrophecms login-recaptcha: before 1.2.1

References

• 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
• https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-44qr-rrjg-2cqq

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