CVE-2020-15514: The jh_captcha extension through 2.1.3, and 3.x through 3.0.2, for TYPO3 allows XSS.

Routine

MEDIUM 5.4UPGRADE

CVE-2020-15514 is a medium-severity flaw (CVSS 5.4) affecting jh captcha. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The jh_captcha extension through 2.1.3, and 3.x through 3.0.2, for TYPO3 allows XSS.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-07-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jh captcha project

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

Am I affected?

Timeline

2020-07-07 14:15 UTCPublished CVE record published
2026-06-17 02:56 UTCUpdated Record last modified

jh captcha project jh captcha UPGRADE

Affected: <= 2.1.3 · >= 3.0.0 and <= 3.0.2

Fixed in: newer than 3.0.2

Safe to downgrade to: a release before 3.0.0

1. Check installed version

apt-cache policy jh-captcha || rpm -q jh-captcha || jh-captcha --version

2. UPGRADE to newer than 3.0.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jh-captcha

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jh-captcha

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.0.0 (Debian / Ubuntu)

apt-cache madison jh-captcha sudo apt install jh-captcha=<VERSION_BEFORE_3.0.0> sudo apt-mark hold jh-captcha

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jh-captcha sudo dnf downgrade jh-captcha-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add jh-captcha

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-2020-15514?

jh captcha: upgrade to newer than 3.0.2. Exact commands for each OS are on this page.

Is CVE-2020-15514 being exploited?

CVE-2020-15514 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-2020-15514 affect?

CVE-2020-15514 affects jh captcha. Severity is medium (CVSS 5.4). The jh_captcha extension through 2.1.3, and 3.x through 3.0.2, for TYPO3 allows XSS.

How urgent is CVE-2020-15514?

Priority 30/100. No elevated risk signals yet.

Software pages

TYPO3 vulnerabilities

References

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