CVE-2026-49953

Discuz! X5.0 (builds 20260320–20260610) contains a CAPTCHA bypass vulnerability where limited complexity and predictable character sets in generated CAPTCHA images enable unauthenticated remote attackers to reliably predict challenge text via OCR, bypassing protections on login, registration and ...

CVE-2026-49953 Discuz! X5.0 CAPTCHA Bypass via Predictable Character Set

Discuz! X5.0 releases 20260320 through 20260610 contains a CAPTCHA bypass vulnerability that allows unauthenticated remote attackers to defeat challenge controls by exploiting limited complexity and predictable character sets in generated CAPTCHA images. Attackers can train a custom optical...

PT-2026-49308

Discuz! X5.0 releases 20260320 through 20260501 contains a CAPTCHA bypass vulnerability that allows unauthenticated remote attackers to defeat challenge controls by exploiting limited complexity and predictable character sets in generated CAPTCHA images. Attackers can train a custom optical...

CVE-2026-49953: Guessable CAPTCHA

Discuz! X5.0 releases 20260320 through 20260610 contains a CAPTCHA bypass vulnerability that allows unauthenticated remote attackers to defeat challenge controls by exploiting limited complexity and predictable character sets in generated CAPTCHA images. Attackers can train a custom optical...

Google Speech-to-Text API Can Help Attackers Easily Bypass Google reCAPTCHA

A three-year-old attack technique to bypass Google's audio reCAPTCHA by using its own Speech-to-Text API has been found to still work with 97% accuracy. Researcher Nikolai Tschacher disclosed his findings in a proof-of-concept PoC of the attack on January 2. "The idea of the attack is very simple...

Pluggable CAPTCHA

panel:bgColor=e7f4fa NOTE: This suggestion is for JIRA Server. Using JIRA Cloud? See the corresponding suggestion|http://jira.atlassian.com/browse/JRACLOUD-21359. panel CAPTCHA should be pluggable in JIRA CAPTCHA|http://en.wikipedia.org/wiki/CAPTCHA is supposed to stop spam and other automated...

Drupal Multiple Module $_SESSION Manipulation CAPTCHA Bypass

The version of Drupal installed on the remote host includes at least one third-party module that adds a captcha to various forms e.g. user registration that is affected by a security bypass vulnerability. A remote attacker, using a specially crafted 'editcaptcharesponse' parameter, can bypass...