Read the docs
TI-2026-76771 Aliases CVE-2026-112067GHSA-mf3p-7j87-6qr4

Guessable CAPTCHA in TYPO3 Accessible Form Captcha extension

Priority LOW 37CWE-656Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

The TYPO3 extension "Accessible Form Captcha" (bw_captcha) from 4.0.0 before 5.4.2 hides the correct answer to each CAPTCHA inside the CAPTCHA image data. Anyone who can request a CAPTCHA image can read the answer and submit it, so automated clients can pass the challenge (CWE-804). The audio feature that embeds the answer is enabled by default, so the default configuration is affected. Forms that rely on this CAPTCHA as their only protection against bots are exposed to abuse.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00375 31st percentileScored 2026-11-07
Fix Fixed Extension "Accessible Form Captcha" (TYPO3): 5.4.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
TYPO3Extension "Accessible Form Captcha"4.0.0 to before 5.4.25.4.2Patch availableCNA
  • Extension "Accessible Form Captcha" VendorTYPO3 Affected 4.0.0 to before 5.4.2 Fixed in 5.4.2 Patch available CNA

Remediation

Update the TYPO3 extension "Accessible Form Captcha" (bw_captcha) to version 5.4.2. The sources list no fixed version for other releases of this extension.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Extension "Accessible Form Captcha" (TYPO3) Fixed in 5.4.2

Timeline

  1. 2026-10-20 Threatist record created from CVE-2026-112067
  2. 2026-10-20 Alias added: GHSA-mf3p-7j87-6qr4
  3. 2026-10-20 CISA SSVC decision points changed
  4. 2026-10-20 Priority changed: MEDIUM → LOW

References

Advisory 1

  • TI-2023-10314 Persisted Cross-Site Scripting in Frontend Rendering in typo3 CVSS 3.1HIGH 8.8
  • TI-2010-03538 The jumpUrl (aka access tracking) implementation in tslib/class.tslib_fe.php in TYPO3… CVSS 2.0HIGH 7.1
  • TI-2009-00775 The jumpUrl mechanism in class.tslib_fe.php in TYPO3 3.3.x through 3.8.x, 4.0 before… CVSS 2.0MEDIUM 5.0
  • TI-2025-30547 The sr_feuser_register extension through 12.4.8 for TYPO3 allows Remote Code Execution. CVSS 3.1CRITICAL 10.0
  • TI-2019-08867 The PharStreamWrapper (aka phar-stream-wrapper) package 2.x before 2.1.1 and 3.x before… CVSS 3.1CRITICAL 9.8
  • TI-2008-04019 Unspecified vulnerability in the TYPO3 Secure Directory (kw_secdir) extension before… CVSS 2.0HIGH 10.0
See all 411 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences