CVE-2002-1830: Open Bulletin Board (OpenBB) 1.0.0 RC3 allows remote attackers to bypass authentication and access modifier op

This month

MEDIUM 5.0DOWNGRADE

CVE-2002-1830 is a medium-severity flaw (CVSS 5.0) affecting openbb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Open Bulletin Board (OpenBB) 1.0.0 RC3 allows remote attackers to bypass authentication and access modifier options via a direct request to moderator.php with the action and ismod parameters.

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	7.1% (top 6%)
CISA exploited list	No
Published	2002-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: openbb

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

Am I affected?

Timeline

2002-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:00 UTCUpdated Record last modified

openbb openbb DOWNGRADE

Affected: 1.0.0_rc1 · 1.0.0_rc2 · 1.0.0_rc3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0_rc1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.0_rc1 (Debian / Ubuntu)

apt-cache madison openbb sudo apt install openbb=<VERSION_BEFORE_1.0.0_rc1> sudo apt-mark hold openbb

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

dnf --showduplicates list openbb sudo dnf downgrade openbb-<VERSION_BEFORE_1.0.0_rc1> sudo dnf versionlock add openbb

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: OpenBB 1.0 - Unauthorized Moderator Access

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-2002-1830?

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

Is CVE-2002-1830 being exploited?

CVE-2002-1830 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-2002-1830 affect?

CVE-2002-1830 affects openbb. Severity is medium (CVSS 5.0). Open Bulletin Board (OpenBB) 1.0.0 RC3 allows remote attackers to bypass authentication and access modifier options via a direct request to moderator.php with the action and ismod parameters.

How urgent is CVE-2002-1830?

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

Software pages

PHP vulnerabilities

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References

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