CVE-2023-26559: A directory traversal vulnerability in Oxygen XML Web Author before 25.0.0.3 build 2023021715 and Oxygen Conte

Routine

MEDIUM 5.3REMOTEUPGRADEUPGRADE

CVE-2023-26559 is a medium-severity flaw (CVSS 5.3) affecting oxygen content fusion, oxygen xml web author. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A directory traversal vulnerability in Oxygen XML Web Author before 25.0.0.3 build 2023021715 and Oxygen Content Fusion before 5.0.3 build 2023022015 allows an attacker to read files from a WEB-INF directory via a crafted HTTP request. (XML Web Author 24.1.0.3 build 2023021714 and 23.1.1.4 build 2023021715 are also fixed versions.)

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-22
Published	2023-04-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sync

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

Am I affected?

Timeline

2023-04-14 13:15 UTCPublished CVE record published
2026-06-17 05:43 UTCUpdated Record last modified

sync oxygen content fusion UPGRADE

Affected: < 5.0.3

Fixed in: 5.0.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy oxygen-content-fusion || rpm -q oxygen-content-fusion || oxygen-content-fusion --version

2. UPGRADE to 5.0.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade oxygen-content-fusion

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade oxygen-content-fusion

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

sync oxygen xml web author UPGRADE

Affected: < 23.1.1.4 · >= 24.0.0.0 and < 24.1.0.3 · >= 25.0.0.0 and < 25.1.0.3

Fixed in: 23.1.1.4, 24.1.0.3, 25.1.0.3

Safe to downgrade to: a release before 24.0.0.0

1. Check installed version

apt-cache policy oxygen-xml-web-author || rpm -q oxygen-xml-web-author || oxygen-xml-web-author --version

2. UPGRADE to 23.1.1.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade oxygen-xml-web-author

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade oxygen-xml-web-author

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 24.0.0.0 (Debian / Ubuntu)

apt-cache madison oxygen-xml-web-author sudo apt install oxygen-xml-web-author=<VERSION_BEFORE_24.0.0.0> sudo apt-mark hold oxygen-xml-web-author

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

dnf --showduplicates list oxygen-xml-web-author sudo dnf downgrade oxygen-xml-web-author-<VERSION_BEFORE_24.0.0.0> sudo dnf versionlock add oxygen-xml-web-author

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-2023-26559?

oxygen content fusion: upgrade to 5.0.3; oxygen xml web author: upgrade to 23.1.1.4, 24.1.0.3, 25.1.0.3. Exact commands for each OS are on this page.

Is CVE-2023-26559 being exploited?

CVE-2023-26559 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-2023-26559 affect?

CVE-2023-26559 affects oxygen content fusion, oxygen xml web author. Severity is medium (CVSS 5.3). A directory traversal vulnerability in Oxygen XML Web Author before 25.0.0.3 build 2023021715 and Oxygen Content Fusion before 5.0.3 build 2023022015 allows an attacker to read files from a WEB-INF directory via a crafted HTTP request. (XML

How urgent is CVE-2023-26559?

Priority 39/100. Remotely exploitable, no login, no user action

References

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