CVE-2021-39362: An XSS issue was discovered in ReCaptcha Solver 5.7

Routine

MEDIUM 6.1DOWNGRADE

CVE-2021-39362 is a medium-severity flaw (CVSS 6.1) affecting recaptcha solver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-08-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: recaptcha solver project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-08-22 20:15 UTCPublished CVE record published
2026-06-17 04:03 UTCUpdated Record last modified

recaptcha solver project recaptcha solver DOWNGRADE

Affected: 5.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.7

1. Check installed version

apt-cache policy recaptcha-solver || rpm -q recaptcha-solver || recaptcha-solver --version

2. No fixed release: DOWNGRADE to a release before 5.7 (Debian / Ubuntu)

apt-cache madison recaptcha-solver sudo apt install recaptcha-solver=<VERSION_BEFORE_5.7> sudo apt-mark hold recaptcha-solver

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list recaptcha-solver sudo dnf downgrade recaptcha-solver-<VERSION_BEFORE_5.7> sudo dnf versionlock add recaptcha-solver

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-39362?

recaptcha solver: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-39362 being exploited?

CVE-2021-39362 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-39362 affect?

CVE-2021-39362 affects recaptcha solver. Severity is medium (CVSS 6.1). 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, resultin

How urgent is CVE-2021-39362?

Priority 33/100. No elevated risk signals yet.

References

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