CVE-2002-0535: Cross-site scripting vulnerabilities in PostBoard 2.0.1 and earlier allows remote attackers to execute script

This month

MEDIUM 5.0DOWNGRADEDOWNGRADE

CVE-2002-0535 is a medium-severity flaw (CVSS 5.0) affecting postboard, postnuke. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting vulnerabilities in PostBoard 2.0.1 and earlier allows remote attackers to execute script as other users via (1) an [IMG] tag when BBCode is enabled, or (2) in a topic title.

Why this priority

EPSS top 6%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	7.4% (top 6%)
CISA exploited list	No
Published	2002-07-03
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: postboard · postnuke software foundation

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2002-07-03 04:00 UTCPublished CVE record published
2026-06-16 21:57 UTCUpdated Record last modified

postboard postboard DOWNGRADE

Affected: 2.0 · 2.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison postboard sudo apt install postboard=<VERSION_BEFORE_2.0> sudo apt-mark hold postboard

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

dnf --showduplicates list postboard sudo dnf downgrade postboard-<VERSION_BEFORE_2.0> sudo dnf versionlock add postboard

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.

postnuke software foundation postnuke DOWNGRADE

Affected: 0.64 · 0.70 · 0.71 · 0.703

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.64

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.64 (Debian / Ubuntu)

apt-cache madison postnuke sudo apt install postnuke=<VERSION_BEFORE_0.64> sudo apt-mark hold postnuke

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

dnf --showduplicates list postnuke sudo dnf downgrade postnuke-<VERSION_BEFORE_0.64> sudo dnf versionlock add postnuke

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: PostBoard 2.0 - BBCode IMG Tag Script Injection
Exploit-DB: PostBoard 2.0 - Topic Title Script Execution

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-2002-0535?

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

Is CVE-2002-0535 being exploited?

CVE-2002-0535 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-2002-0535 affect?

CVE-2002-0535 affects postboard, postnuke. Severity is medium (CVSS 5.0). Cross-site scripting vulnerabilities in PostBoard 2.0.1 and earlier allows remote attackers to execute script as other users via (1) an [IMG] tag when BBCode is enabled, or (2) in a topic title.

How urgent is CVE-2002-0535?

Priority 46/100. EPSS top 6%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2002-0534 MEDIUM 5.0 DOWNGRADE PostBoard 2.0.1 and earlier with BBcode allows remote attackers to cause a denial of service (CPU consumption)

References

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