CVE-2026-23885: Alchemy is an open source content management system engine written in Ruby on Rails

Routine

MEDIUM 6.4UPGRADE

CVE-2026-23885 is a medium-severity flaw (CVSS 6.4) affecting alchemy cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Alchemy is an open source content management system engine written in Ruby on Rails. Prior to versions 7.4.12 and 8.0.3, the application uses the Ruby `eval()` function to dynamically execute a string provided by the `resource_handler.engine_name` attribute in `Alchemy::ResourcesHelper#resource_url_proxy`. The vulnerability exists in `app/helpers/alchemy/resources_helper.rb` at line 28. The code explicitly bypasses security linting with `# ruboco

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.4 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-95
Published	2026-01-19
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: alchemy-cms

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

Am I affected?

Timeline

2026-01-19 22:16 UTCPublished CVE record published
2026-06-17 10:22 UTCUpdated Record last modified

alchemy-cms alchemy cms UPGRADE

Affected: < 7.4.12 · >= 8.0.0 and < 8.0.3

Fixed in: 7.4.12, 8.0.3

Safe to downgrade to: a release before 8.0.0

1. Check installed version

apt-cache policy alchemy-cms || rpm -q alchemy-cms || alchemy-cms --version

2. UPGRADE to 7.4.12 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade alchemy-cms

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade alchemy-cms

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 8.0.0 (Debian / Ubuntu)

apt-cache madison alchemy-cms sudo apt install alchemy-cms=<VERSION_BEFORE_8.0.0> sudo apt-mark hold alchemy-cms

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

dnf --showduplicates list alchemy-cms sudo dnf downgrade alchemy-cms-<VERSION_BEFORE_8.0.0> sudo dnf versionlock add alchemy-cms

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-2026-23885?

alchemy cms: upgrade to 7.4.12, 8.0.3. Exact commands for each OS are on this page.

Is CVE-2026-23885 being exploited?

CVE-2026-23885 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-2026-23885 affect?

CVE-2026-23885 affects alchemy cms. Severity is medium (CVSS 6.4). Alchemy is an open source content management system engine written in Ruby on Rails. Prior to versions 7.4.12 and 8.0.3, the application uses the Ruby `eval()` function to dynamically execute a string provided by the `resource_handler.engin

How urgent is CVE-2026-23885?

Priority 33/100. No elevated risk signals yet.

Software pages

Ruby on Rails vulnerabilities · Ruby vulnerabilities

References

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