CVE-2021-39362

Name: CVE-2021-39362
Creator: NVD / NIST
Published: 2021-08-22T20:15:49.113+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.58%

Last modified Jun 17, 2026

CVE-2021-39362 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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.. EPSS estimates a 0.58% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.58%

43.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Recaptcha Solver Project	Recaptcha Solver	5.7

References

https://thesamarkand.tumblr.com/post/660171228514009088/xss-vulnerability-in-recaptcha-solver-by-dozzThird Party Advisory
https://thesamarkand.tumblr.com/post/660171228514009088/xss-vulnerability-in-recaptcha-solver-by-dozzThird Party Advisory

Timeline

Published: Aug 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39362?

How severe is CVE-2021-39362?

CVE-2021-39362 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39362?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-39362?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST