CVE-2023-0549: A vulnerability, which was classified as problematic, has been found in YAFNET up to 3.1.10

Routine

LOW 3.5UPGRADE

CVE-2023-0549 is a low-severity flaw (CVSS 3.5) affecting yaf.net. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability, which was classified as problematic, has been found in YAFNET up to 3.1.10. This issue affects some unknown processing of the file /forum/PostPrivateMessage of the component Private Message Handler. The manipulation of the argument subject/message leads to cross site scripting. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 3.1.11 is able to address this is

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	3.5 (Low)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-01-27
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: yetanotherforum

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

Am I affected?

Timeline

2023-01-27 19:15 UTCPublished CVE record published
2026-06-17 05:25 UTCUpdated Record last modified

yetanotherforum yaf.net UPGRADE

Affected: >= 3.1.0 and <= 3.1.10

Fixed in: newer than 3.1.10

Safe to downgrade to: a release before 3.1.0

1. Check installed version

apt-cache policy yaf.net || rpm -q yaf.net || yaf.net --version

2. UPGRADE to newer than 3.1.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade yaf.net

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade yaf.net

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 3.1.0 (Debian / Ubuntu)

apt-cache madison yaf.net sudo apt install yaf.net=<VERSION_BEFORE_3.1.0> sudo apt-mark hold yaf.net

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

dnf --showduplicates list yaf.net sudo dnf downgrade yaf.net-<VERSION_BEFORE_3.1.0> sudo dnf versionlock add yaf.net

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-2023-0549?

yaf.net: upgrade to newer than 3.1.10. Exact commands for each OS are on this page.

Is CVE-2023-0549 being exploited?

CVE-2023-0549 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-2023-0549 affect?

CVE-2023-0549 affects yaf.net. Severity is low (CVSS 3.5). A vulnerability, which was classified as problematic, has been found in YAFNET up to 3.1.10. This issue affects some unknown processing of the file /forum/PostPrivateMessage of the component Private Message Handler. The manipulation of the

How urgent is CVE-2023-0549?

Priority 30/100. Public exploit reference

Related CVEs

CVE-2023-0650 LOW 3.5 UPGRADE A vulnerability was found in YAFNET up to 3.1.11 and classified as problematic

References

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