CVE-2022-21648: Latte is an open source template engine for PHP

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HIGH 8.2UPGRADE

CVE-2022-21648 is a high-severity flaw (CVSS 8.2) affecting latte. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Latte is an open source template engine for PHP. Versions since 2.8.0 Latte has included a template sandbox and in affected versions it has been found that a sandbox escape exists allowing for injection into web pages generated from Latte. This may lead to XSS attacks. The issue is fixed in the versions 2.8.8, 2.9.6 and 2.10.8. Users unable to upgrade should not accept template input from untrusted sources.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 42%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-01-04
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: nette

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

Am I affected?

Timeline

2022-01-04 20:15 UTCPublished CVE record published
2026-06-17 04:26 UTCUpdated Record last modified

nette latte UPGRADE

Affected: >= 2.8.0 and < 2.8.8 · >= 2.9.0 and < 2.9.6 · >= 2.10.0 and < 2.10.8

Fixed in: 2.8.8, 2.9.6, 2.10.8

Safe to downgrade to: a release before 2.8.0

1. Check installed version

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

2. UPGRADE to 2.8.8 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade latte

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 2.8.0 (Debian / Ubuntu)

apt-cache madison latte sudo apt install latte=<VERSION_BEFORE_2.8.0> sudo apt-mark hold latte

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

dnf --showduplicates list latte sudo dnf downgrade latte-<VERSION_BEFORE_2.8.0> sudo dnf versionlock add latte

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-2022-21648?

latte: upgrade to 2.8.8, 2.9.6, 2.10.8. Exact commands for each OS are on this page.

Is CVE-2022-21648 being exploited?

CVE-2022-21648 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-2022-21648 affect?

CVE-2022-21648 affects latte. Severity is high (CVSS 8.2). Latte is an open source template engine for PHP. Versions since 2.8.0 Latte has included a template sandbox and in affected versions it has been found that a sandbox escape exists allowing for injection into web pages generated from Latte.

How urgent is CVE-2022-21648?

Priority 43/100. High severity

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-23803 CRITICAL 9.8 UPGRADE This affects the package latte/latte before 2.10.6

References

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