CVE-2023-30331: An issue in the render function of beetl v3.15.0 allows attackers to execute server-side template injection (S

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2023-30331 is a critical-severity flaw (CVSS 9.8) affecting beetl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue in the render function of beetl v3.15.0 allows attackers to execute server-side template injection (SSTI) via a crafted payload.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Published	2023-05-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: beetl project

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

Am I affected?

Timeline

2023-05-04 03:15 UTCPublished CVE record published
2026-06-17 05:54 UTCUpdated Record last modified

beetl project beetl DOWNGRADE

Affected: 3.15 0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.15

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.15 (Debian / Ubuntu)

apt-cache madison beetl sudo apt install beetl=<VERSION_BEFORE_3.15> sudo apt-mark hold beetl

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

dnf --showduplicates list beetl sudo dnf downgrade beetl-<VERSION_BEFORE_3.15> sudo dnf versionlock add beetl

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-2023-30331?

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

Is CVE-2023-30331 being exploited?

CVE-2023-30331 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-2023-30331 affect?

CVE-2023-30331 affects beetl. Severity is critical (CVSS 9.8). An issue in the render function of beetl v3.15.0 allows attackers to execute server-side template injection (SSTI) via a crafted payload.

How urgent is CVE-2023-30331?

Priority 59/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-22533 CRITICAL 9.8 DOWNGRADE Before Beetl v3.15.12, the rendering template has a server-side template injection (SSTI) vulnerability

References

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