CVE-2026-112067: Captcha Bypass in extension "Accessible Form Captcha" (bw_captcha)
The extension hides the correct answer to each CAPTCHA inside the image data of the CAPTCHA itself. Anyone who can request a CAPTCHA image can read the answer from it and submit it, so automated clients can pass the challenge. This applies to the default configuration, because the audio feature that causes the answer to be embedded is enabled by default. Forms that rely on the CAPTCHA as their only protection against automated submissions are exposed to abuse by bots.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Disable the audio feature, which embeds the CAPTCHA answer in the image data.
Accessible Form Captcha (bw_captcha) audio feature = disabled
Event History
Frequently Asked Questions
Who is exposed to automated abuse?
Any form protected only by this CAPTCHA is exposed, because bots can request the CAPTCHA image, extract the embedded answer, and submit it successfully.
Is a non-default configuration required for exploitation?
No. The audio feature that embeds the answer in the CAPTCHA image is enabled by default, so default installations are affected.
What does an attacker need to bypass the CAPTCHA?
The attacker only needs to be able to request a CAPTCHA image. They can read the answer from the image data and use it to complete the challenge.