Common Weakness Enumeration
CWE-804
Weakness AllowedGuessable CAPTCHA
Abstraction: Base · Status: Incomplete
The product uses a CAPTCHA challenge, but the challenge can be guessed or automatically recognized by a non-human actor.
Technical nuance
An automated attacker could bypass the intended protection of the CAPTCHA challenge and perform actions at a higher frequency than humanly possible, such as launching spam attacks.
There can be several different causes of a guessable CAPTCHA:
An audio or visual image that does not have sufficient distortion from the unobfuscated source image.
A question is generated with a format that can be automatically recognized, such as a math question.
A question for which the number of possible answers is limited, such as birth years or favorite sports teams.
A general-knowledge or trivia question for which the answer can be accessed using a data base, such as country capitals or popular entertainers.
Other data associated with the CAPTCHA may provide hints about its contents, such as an image whose filename contains the word that is used in the CAPTCHA.
Mapping guidance
This CWE entry is at the Base level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.
Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.
Modes of introduction
Architecture and Design
Implementation
Content history
Submission: CWE Content Team
· MITRE
· 2010-01-15
· CWE 1.8
New entry to handle anti-automation as identified in WASC.
Modification: CWE Content Team
· MITRE
· 2010-06-21
· CWE 1.9
updated Common_Consequences
Modification: CWE Content Team
· MITRE
· 2011-06-01
· CWE 1.13
updated Common_Consequences, Relationships
Modification: CWE Content Team
· MITRE
· 2017-11-08
· CWE 3.0
updated Applicable_Platforms, Likelihood_of_Exploit
Modification: CWE Content Team
· MITRE
· 2020-02-24
· CWE 4.0
updated Relationships
Modification: CWE Content Team
· MITRE
· 2022-10-13
· CWE 4.9
updated Description, Relationships
Modification: CWE Content Team
· MITRE
· 2023-01-31
· CWE 4.10
updated Description
Modification: CWE Content Team
· MITRE
· 2023-04-27
· CWE 4.11
updated Relationships
Modification: CWE Content Team
· MITRE
· 2023-06-29
· CWE 4.12
updated Mapping_Notes
Modification: CWE Content Team
· MITRE
· 2023-10-26
· CWE 4.13
updated Observed_Examples
Modification: CWE Content Team
· MITRE
· 2026-10-28
· CWE 5.0
updated Description, Mapping_Notes, Technical_Nuance, Weakness_Ordinalities
32 vulnerabilities reference this CWE, most recent first.
CVE-2026-112067 (GCVE-0-2026-112067)
Vulnerability from cvelistv5 – Published: 2026-10-20 09:30 – Updated: 2026-10-24 07:24
VLAI
EPSS
VEX
Title
Captcha Bypass in extension "Accessible Form Captcha" (bw_captcha)
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-20 19:07 UTC
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://typo3.org/security/advisory/typo3-ext-sa-… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| TYPO3 | Extension "Accessible Form Captcha" |
Affected:
4.0.0 , < 5.4.2
(semver)
|
Date Public
2026-10-20 09:00
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CVE-2026-111278 (GCVE-0-2026-111278)
Vulnerability from cvelistv5 – Published: 2026-10-15 21:43 – Updated: 2026-10-16 17:09
VLAI
EPSS
VEX
Title
NivoCart through 2.5.1 CAPTCHA Bypass via Answer Disclosed in Page HTML
Summary
NivoCart through 2.5.1 contains a CAPTCHA bypass vulnerability that allows unauthenticated attackers to defeat form protection because the expected code is printed as plain text in the HTML. Attackers can fetch protected forms, extract the captcha_image value with a pattern match, and submit it to automate spam, registrations, reviews, and account deletion requests.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 16:46 UTC
CWE
- CWE-804 - Guessable CAPTCHA
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/nivocart/nivocart/issues/27 | issue-tracking |
| https://github.com/nivocart/nivocart/blob/5bc2c3f… | technical-description |
| https://github.com/nivocart/nivocart/blob/5bc2c3f… | technical-description |
| https://github.com/nivocart/nivocart | product |
| https://www.vulncheck.com/advisories/nivocart-thr… | third-party-advisory |
Date Public
2026-10-15 00:00
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CVE-2026-49953 (GCVE-0-2026-49953)
Vulnerability from cvelistv5 – Published: 2026-06-15 18:45 – Updated: 2026-07-28 01:49 X_Open Source
VLAI
EPSS
VEX
Title
Discuz! X5.0 CAPTCHA Bypass via Predictable Character Set
Summary
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 character recognition model against collected CAPTCHA samples to reliably predict challenge text, bypassing protections on login, registration, and other functionality from automated abuse.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-15 22:04 UTC
CWE
- CWE-804 - Guessable CAPTCHA
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://karmainsecurity.com/KIS-2026-10 | technical-description |
| https://karmainsecurity.com/chaining-bugs-in-disc… | exploit |
| https://www.vulncheck.com/advisories/discuz-x5-0-… | third-party-advisory |
| http://seclists.org/fulldisclosure/2026/Jun/4 |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Discuz! | Discuz! X5.0 |
Affected:
20260320 , ≤ 20260610
(date)
cpe:2.3:a:discuz:discuzx:*:*:*:*:*:*:*:* |
Date Public
2026-06-13 00:00
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CVE-2026-40935 (GCVE-0-2026-40935)
Vulnerability from cvelistv5 – Published: 2026-04-21 22:21 – Updated: 2026-04-22 18:36
VLAI
EPSS
VEX
Title
WWBN/AVideo has CAPTCHA Bypass via Attacker-Controlled Length Parameter and Missing Token Invalidation on Failure
Summary
WWBN AVideo is an open source video platform. In versions 29.0 and prior, `objects/getCaptcha.php` accepts the CAPTCHA length (`ql`) directly from the query string with no clamping or sanitization, letting any unauthenticated client force the server to generate a 1-character CAPTCHA word. Combined with a case-insensitive `strcasecmp` comparison over a ~33-character alphabet and the fact that failed validations do NOT consume the stored session token, an attacker can trivially brute-force the CAPTCHA on any endpoint that relies on `Captcha::validation()` (user registration, password recovery, contact form, etc.) in at most ~33 requests per session. Commit bf1c76989e6a9054be4f0eb009d68f0f2464b453 contains a fix.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-22 18:34 UTC
CWE
- CWE-804 - Guessable CAPTCHA
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/WWBN/AVideo/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/WWBN/AVideo/commit/bf1c76989e6… | x_refsource_MISC |
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CVE-2026-27411 (GCVE-0-2026-27411)
Vulnerability from cvelistv5 – Published: 2026-03-05 05:54 – Updated: 2026-04-29 09:51
VLAI
EPSS
VEX
Title
WordPress SiteGuard WP plugin plugin <= 1.7.9 - Captcha Bypass vulnerability
Summary
Guessable CAPTCHA vulnerability in jp-secure SiteGuard WP Plugin siteguard allows Functionality Bypass.This issue affects SiteGuard WP Plugin: from n/a through <= 1.7.9.
Severity
5.4 (Medium)
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-09 14:58 UTC
CWE
- CWE-804 - Guessable CAPTCHA
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://patchstack.com/database/Wordpress/Plugin/… | vdb-entry |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| jp-secure | SiteGuard WP Plugin |
Affected:
0 , ≤ 1.7.9
(custom)
|
Date Public
2026-04-22 14:19
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CVE-2026-13082 (GCVE-0-2026-13082)
Vulnerability from cvelistv5 – Published: 2026-07-17 12:54 – Updated: 2026-07-17 17:29
VLAI
EPSS
VEX
Title
GD::SecurityImage versions through 1.75 for Perl use rand to generate secrets
Summary
GD::SecurityImage versions through 1.75 for Perl use rand to generate secrets.
The random method creates the challenge text used for the CAPTCHA by sampling characters from an array using Perl's built-in rand function, and generates a (by default) six-character string.
The built-in rand function is unsuitable for security applications because it is predictable and reversible.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 17:29 UTC
CWE
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| BURAK | GD::SecurityImage |
Affected:
0 , ≤ 1.75
(custom)
|
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CVE-2025-40916 (GCVE-0-2025-40916)
Vulnerability from cvelistv5 – Published: 2025-06-16 11:01 – Updated: 2025-06-16 13:31
VLAI
EPSS
VEX
Title
Mojolicious::Plugin::CaptchaPNG version 1.05 for Perl uses a weak random number source for generating the captcha text
Summary
Mojolicious::Plugin::CaptchaPNG version 1.05 for Perl uses a weak random number source for generating the captcha.
That version uses the built-in rand() function for generating the captcha text as well as image noise, which is insecure.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-06-16 13:31 UTC
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GRYPHON | Mojolicious::Plugin::CaptchaPNG |
Affected:
1.05
(custom)
|
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CVE-2025-32036 (GCVE-0-2025-32036)
Vulnerability from cvelistv5 – Published: 2025-04-08 18:06 – Updated: 2025-04-08 18:27
VLAI
EPSS
VEX
Title
DNN allows the possibility of bypassing Captcha
Summary
DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. The algorithm used to generate the captcha image shows the least complexity of the desired image. For this reason, the created image can be easily read by OCR tools, and the intruder can send automatic requests by building a robot and using this tool. This vulnerability is fixed in 9.13.8.
Severity
4.2 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-08 18:26 UTC
CWE
- CWE-804 - Guessable CAPTCHA
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/dnnsoftware/Dnn.Platform/secur… | x_refsource_CONFIRM |
| https://github.com/dnnsoftware/Dnn.Platform/commi… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| dnnsoftware | Dnn.Platform |
Affected:
< 9.13.8
|
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CVE-2025-10423 (GCVE-0-2025-10423)
Vulnerability from cvelistv5 – Published: 2025-09-15 03:02 – Updated: 2025-09-15 17:10
VLAI
EPSS
VEX
Title
newbee-mall kaptcha mallKaptcha Captcha
Summary
A vulnerability was found in newbee-mall 1.0. Impacted is the function mallKaptcha of the file /common/mall/kaptcha. The manipulation results in guessable captcha. The attack can be executed remotely. A high complexity level is associated with this attack. The exploitability is considered difficult. The exploit has been made public and could be used.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-15 17:10 UTC
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.323857 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.323857 | signaturepermissions-required |
| https://vuldb.com/?submit.647066 | third-party-advisory |
| https://github.com/newbee-ltd/newbee-mall/issues/101 | issue-tracking |
| https://github.com/newbee-ltd/newbee-mall/issues/… | exploitissue-tracking |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | newbee-mall |
Affected:
1.0
|
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CVE-2025-8546 (GCVE-0-2025-8546)
Vulnerability from cvelistv5 – Published: 2025-08-05 05:02 – Updated: 2025-08-05 16:17
VLAI
EPSS
VEX
Title
atjiu pybbs Verification Code login Captcha
Summary
A vulnerability, which was classified as problematic, was found in atjiu pybbs up to 6.0.0. This affects the function adminlogin/login of the component Verification Code Handler. The manipulation leads to guessable captcha. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The patch is named ecaf8d46944fd03e3c4ea05698f8acf0aaa570cf. It is recommended to apply a patch to fix this issue.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-08-05 16:17 UTC
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.318675 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.318675 | signaturepermissions-required |
| https://vuldb.com/?submit.622179 | third-party-advisory |
| https://github.com/atjiu/pybbs/issues/199 | issue-tracking |
| https://github.com/atjiu/pybbs/issues/199#issueco… | issue-tracking |
| https://github.com/atjiu/pybbs/issues/199#issue-3… | exploitissue-tracking |
| https://github.com/atjiu/pybbs/commit/ecaf8d46944… | patch |
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No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.