CVE-2019-10770: All versions of io.ratpack:ratpack-core from 0.9.10 inclusive and before 1.7.6 are vulnerable to Cross-site Sc

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MEDIUM 6.1UPGRADE

CVE-2019-10770 is a medium-severity flaw (CVSS 6.1) affecting ratpack. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

All versions of io.ratpack:ratpack-core from 0.9.10 inclusive and before 1.7.6 are vulnerable to Cross-site Scripting (XSS). This affects the development mode error handler when an exception message contains untrusted data. Note the production mode error handler is not vulnerable - so for this to be utilized in production it would require users to not disable development mode.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 42%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-01-28
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: ratpack

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

Am I affected?

Timeline

2020-01-28 01:15 UTCPublished CVE record published
2026-06-17 02:11 UTCUpdated Record last modified

ratpack ratpack UPGRADE

Affected: >= 0.9.10 and < 1.7.6

Fixed in: 1.7.6

Safe to downgrade to: a release before 0.9.10

1. Check installed version

apt-cache policy ratpack || rpm -q ratpack || ratpack --version

2. UPGRADE to 1.7.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ratpack

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ratpack

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 0.9.10 (Debian / Ubuntu)

apt-cache madison ratpack sudo apt install ratpack=<VERSION_BEFORE_0.9.10> sudo apt-mark hold ratpack

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

dnf --showduplicates list ratpack sudo dnf downgrade ratpack-<VERSION_BEFORE_0.9.10> sudo dnf versionlock add ratpack

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-2019-10770?

ratpack: upgrade to 1.7.6. Exact commands for each OS are on this page.

Is CVE-2019-10770 being exploited?

CVE-2019-10770 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-2019-10770 affect?

CVE-2019-10770 affects ratpack. Severity is medium (CVSS 6.1). All versions of io.ratpack:ratpack-core from 0.9.10 inclusive and before 1.7.6 are vulnerable to Cross-site Scripting (XSS). This affects the development mode error handler when an exception message contains untrusted data. Note the product

How urgent is CVE-2019-10770?

Priority 41/100. Public exploit reference

Related CVEs

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CVE-2021-29481 MEDIUM 6.5 UPGRADE Ratpack is a toolkit for creating web applications
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References

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