2021-39362 | ReCaptcha Solver setCaptchaCode cross site scripting

CVSS Meta Temp Score

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Current Exploit Price (≈)

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CTI Interest Score

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3.0 $0-$5k 0.38

A vulnerability was found in ReCaptcha Solver 5.7. It has been rated as problematic. This issue affects the function setCaptchaCode. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. Impacted is integrity. An attacker might be able to inject arbitrary html and script code into the web site. This would alter the appearance and would make it possible to initiate further attacks against site visitors. The summary by CVE is:

An XSS issue was discovered in ReCaptcha Solver 5.7. A response from Anti-Captcha.com, RuCaptcha.com, 2captcha.com, DEATHbyCAPTCHA.com, ImageTyperz.com, or BestCaptchaSolver.com in setCaptchaCode() is inserted into the DOM as HTML, resulting in full control over the user’s browser by these servers.

The weakness was disclosed 08/23/2021. The advisory is shared at thesamarkand.tumblr.com. The identification of this vulnerability is CVE-2021-39362 since 08/22/2021. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.


VulDB Meta Base Score: 3.1
VulDB Meta Temp Score: 3.0

VulDB Base Score: 3.1
VulDB Temp Score: 3.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

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Vector Complexity Authentication Confidentiality Integrity Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Class: Cross site scripting
ATT&CK: T1059.007

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

08/22/2021 CVE assigned
08/23/2021 +1 days Advisory disclosed
08/23/2021 +0 days VulDB entry created
08/25/2021 +2 days VulDB last updateAdvisory: thesamarkand.tumblr.com
Status: Not defined

CVE: CVE-2021-39362 (🔒)

Created: 08/23/2021 08:05
Updated: 08/25/2021 18:46
Changes: (2) source_cve_assigned source_cve_nvd_summary
Complete: 🔍


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