CVE-2023-42458: Zope is an open-source web application server

Routine

LOW 3.7UPGRADE

CVE-2023-42458 is a low-severity flaw (CVSS 3.7) affecting zope. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Zope is an open-source web application server. Prior to versions 4.8.10 and 5.8.5, there is a stored cross site scripting vulnerability for SVG images. Note that an image tag with an SVG image as source is never vulnerable, even when the SVG image contains malicious code. To exploit the vulnerability, an attacker would first need to upload an image, and then trick a user into following a specially crafted link. Patches are available in Zope 4.8.1

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	3.7 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-79, CWE-80
Published	2023-09-21
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2023-09-21 17:15 UTCPublished CVE record published
2026-06-17 06:23 UTCUpdated Record last modified

zope zope UPGRADE

Affected: < 4.8.10 · >= 5.0.0 and < 5.8.5

Fixed in: 4.8.10, 5.8.5

Safe to downgrade to: a release before 5.0.0

1. Check installed version

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

2. UPGRADE to 4.8.10 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zope

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 5.0.0 (Debian / Ubuntu)

apt-cache madison zope sudo apt install zope=<VERSION_BEFORE_5.0.0> sudo apt-mark hold zope

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

dnf --showduplicates list zope sudo dnf downgrade zope-<VERSION_BEFORE_5.0.0> sudo dnf versionlock add zope

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-2023-42458?

zope: upgrade to 4.8.10, 5.8.5. Exact commands for each OS are on this page.

Is CVE-2023-42458 being exploited?

CVE-2023-42458 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-2023-42458 affect?

CVE-2023-42458 affects zope. Severity is low (CVSS 3.7). Zope is an open-source web application server. Prior to versions 4.8.10 and 5.8.5, there is a stored cross site scripting vulnerability for SVG images. Note that an image tag with an SVG image as source is never vulnerable, even when the SV

How urgent is CVE-2023-42458?

Priority 31/100. Public exploit reference

Related CVEs

CVE-2023-44389 LOW 3.1 UPGRADE Zope is an open-source web application server
CVE-2023-41050 MEDIUM 6.8 UPGRADE UPGRADE AccessControl provides a general security framework for use in Zope

References

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