CVE-2024-29686: Server-side Template Injection (SSTI) vulnerability in Winter CMS v.1.2.3 allows a remote attacker to execute

This month

HIGH 7.2DOWNGRADE

CVE-2024-29686 is a high-severity flaw (CVSS 7.2) affecting winter. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Server-side Template Injection (SSTI) vulnerability in Winter CMS v.1.2.3 allows a remote attacker to execute arbitrary code via a crafted payload to the CMS Pages field and Plugin components. NOTE: the vendor disputes this because the payload could only be entered by a trusted user, such as the owner of the server that hosts Winter CMS, or a developer working for them.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	1.8% (top 21%)
CISA exploited list	No
Weakness	CWE-97
Published	2024-03-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: wintercms

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

Am I affected?

Timeline

2024-03-29 16:15 UTCPublished CVE record published
2026-06-17 07:22 UTCUpdated Record last modified

wintercms winter DOWNGRADE

Affected: 1.2.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.2.3 (Debian / Ubuntu)

apt-cache madison winter sudo apt install winter=<VERSION_BEFORE_1.2.3> sudo apt-mark hold winter

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

dnf --showduplicates list winter sudo dnf downgrade winter-<VERSION_BEFORE_1.2.3> sudo dnf versionlock add winter

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-2024-29686?

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

Is CVE-2024-29686 being exploited?

CVE-2024-29686 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-2024-29686 affect?

CVE-2024-29686 affects winter. Severity is high (CVSS 7.2). Server-side Template Injection (SSTI) vulnerability in Winter CMS v.1.2.3 allows a remote attacker to execute arbitrary code via a crafted payload to the CMS Pages field and Plugin components. NOTE: the vendor disputes this because the payl

How urgent is CVE-2024-29686?

Priority 50/100. High severity; Public exploit reference

Related CVEs

CVE-2026-22254 NONE 0.0 UPGRADE Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework
CVE-2024-54149 HIGH 8.4 UPGRADE Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework

References

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