The Dell Quest One Password Manager, possibly 5.0, allows remote attackers to bypass CAPTCHA protections and obtain sensitive information (user's full name) by sending a login request with a valid domain and username but without the CaptchaType, UseCaptchaEveryTime, and CaptchaResponse parameters.

Open redirect vulnerability in Maag Form Captcha extension 2.0.0 and earlier for TYPO3 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via unspecified vectors.

Multiple cross-site scripting (XSS) vulnerabilities in Pligg CMS before 1.2.2 allow remote attackers to inject arbitrary web script or HTML via (1) an arbitrary parameter in a move or (2) minimize action to admin/admin_index.php; (3) the karma_username parameter to module.php in the karma module; (4) q_1_low, (5) q_1_high, (6) q_2_low, or (7) q_2_high parameter in a configure action to module.php in the captcha module; or (8) the edit parameter to module.php in the admin_language module.

Directory traversal vulnerability in the captcha module in Pligg CMS before 1.2.2 allows remote authenticated users to include and execute arbitrary local files via a .. (dot dot) in the captcha parameter to module.php, as demonstrated by cross-site request forgery (CSRF) attacks.

Cross-site scripting (XSS) vulnerability in captchademo.php in Unijimpe Captcha allows remote attackers to inject arbitrary web script or HTML via the PATH_INFO.

Multiple cross-site scripting (XSS) vulnerabilities in OxWall 1.1.1 and earlier allow remote attackers to inject arbitrary web script or HTML via the (1) captchaField, (2) email, (3) form_name, (4) password, (5) realname, (6) repeatPassword, or (7) username parameters to Oxwall/join; (8) captcha, (9) email, (10) form_name, (11) from, or (12) subject parameters to Oxwall/contact; (13) tag parameter to Oxwall/blogs/browse-by-tag; or (14) PATH_INFO to Oxwall/photo/viewlist/tagged, (15) Oxwall/photo/viewlist, or (16) Oxwall/video/viewlist.

Multiple cross-site request forgery (CSRF) vulnerabilities in the configuration page in the Recaptcha (aka WP-reCAPTCHA) plugin 2.9.8.2 for WordPress allow remote attackers to hijack the authentication of administrators for requests that disable the CAPTCHA requirement or insert cross-site scripting (XSS) sequences via the (1) recaptcha_opt_pubkey, (2) recaptcha_opt_privkey, (3) re_tabindex, (4) error_blank, (5) error_incorrect, (6) mailhide_pub, (7) mailhide_priv, (8) mh_replace_link, or (9) mh_replace_title parameter.

Multiple SQL injection vulnerabilities in ClanSphere 2009.0.3 and earlier allow remote attackers to execute arbitrary SQL commands via (1) the IP address to the cs_getip function in generate.php in the Captcha module, or (2) the s_email parameter to the cs_sql_select function in the MySQL database driver (mysql.php).

Unspecified vulnerability in the session handling feature in freeCap CAPTCHA (sr_freecap) extension 1.2.0 and earlier for TYPO3 has unknown impact and attack vectors.

Peter's Math Anti-Spam Spinoff plugin for WordPress generates audio CAPTCHA clips by concatenating static audio files without any additional distortion, which allows remote attackers to bypass CAPTCHA protection by reading certain bytes from the generated clip.

Directory traversal vulnerability in captcha/captcha_image.php in the RWCards (com_rwcards) 3.0.11 component for Joomla!, when magic_quotes_gpc is disabled, allows remote attackers to include and execute arbitrary local files via directory traversal sequences in the img parameter.

Cross-site scripting (XSS) vulnerability in the freeCap CAPTCHA (sr_freecap) extension before 1.0.4 for TYPO3 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

The CAPTCHA implementation in (1) Pligg 9.9.5 and possibly (2) Francisco Burzi PHP-Nuke 8.1 provides a critical random number (the ts_random value) within the URL in the SRC attribute of an IMG element, which allows remote attackers to pass the CAPTCHA test via a calculation that combines this value with the current date and the HTTP User-Agent string.

Simple Machines Forum (SMF), probably 1.1.4, relies on "randomly generated static" to hinder brute-force attacks on the WAV file (aka audio) CAPTCHA, which allows remote attackers to pass the CAPTCHA test via an automated attack that considers Hamming distances. NOTE: this issue reportedly exists because of an insufficient fix for CVE-2007-3308.

The CAPTCHA implementation as used in (1) Francisco Burzi PHP-Nuke 7.0 and 8.1, (2) my123tkShop e-Commerce-Suite (aka 123tkShop) 0.9.1, (3) phpMyBitTorrent 1.2.2, (4) TorrentFlux 2.3, (5) e107 0.7.11, (6) WebZE 0.5.9, (7) Open Media Collectors Database (aka OpenDb) 1.5.0b4, and (8) Labgab 1.1 uses a code_bg.jpg background image and the PHP ImageString function in a way that produces an insufficient number of different images, which allows remote attackers to pass the CAPTCHA test via an automated attack using a table of all possible image checksums and their corresponding digit strings.

admin/config.php in Evilsentinel 1.0.9 and earlier allows remote attackers to bypass the CAPTCHA test by omitting the es_security_captcha parameter and not invoking captcha.php.

Multiple cross-site scripting (XSS) vulnerabilities in captcha\captcha.php in the Captcha! 2.5d and earlier plugin for WordPress allow remote attackers to inject arbitrary web script or HTML via the (1) captcha_ttffolder, (2) captcha_numchars, (3) captcha_ttfrange, or (4) captcha_secret parameter.

captcha.php in BellaBook (aka BellaBuffs) allows remote attackers to obtain administrative privileges by sending the admin's username (admin_name) in a pheap_login cookie. NOTE: the vendor disputes this vulnerability because authentication data is derived from the admin_pass and secret variables, in addition to the admin_name; and because the exploit code is designed for an unrelated application

Simple Machines Forum (SMF) 1.1.2 uses a concatenation method with insufficient randomization when creating a WAV file CAPTCHA, which allows remote attackers to pass the CAPTCHA test via an automated brute-force attack.

MyBB 1.2.4 allows remote attackers to obtain sensitive information via the (1) action[] parameter to member.php, (2) imagehash[] parameter to captcha.php, and (3) a direct request to inc/datahandlers/event.php, which reveal the installation path in the resulting error message.