CVE-2025-60859: Cross Site Scripting (XSS) vulnerability in Gnuboard 5.6.15 allows authenticated attackers to execute arbitrar

Routine

MEDIUM 6.1DOWNGRADE

CVE-2025-60859 is a medium-severity flaw (CVSS 6.1) affecting gnuboard. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross Site Scripting (XSS) vulnerability in Gnuboard 5.6.15 allows authenticated attackers to execute arbitrary code via crafted c_id parameter in bbs/view_comment.php.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-10-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sir

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

Am I affected?

Timeline

2025-10-23 19:15 UTCPublished CVE record published
2026-06-17 09:50 UTCUpdated Record last modified

sir gnuboard DOWNGRADE

Affected: 5.6.15

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.6.15

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.6.15 (Debian / Ubuntu)

apt-cache madison gnuboard sudo apt install gnuboard=<VERSION_BEFORE_5.6.15> sudo apt-mark hold gnuboard

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

dnf --showduplicates list gnuboard sudo dnf downgrade gnuboard-<VERSION_BEFORE_5.6.15> sudo dnf versionlock add gnuboard

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-2025-60859?

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

Is CVE-2025-60859 being exploited?

CVE-2025-60859 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-2025-60859 affect?

CVE-2025-60859 affects gnuboard. Severity is medium (CVSS 6.1). Cross Site Scripting (XSS) vulnerability in Gnuboard 5.6.15 allows authenticated attackers to execute arbitrary code via crafted c_id parameter in bbs/view_comment.php.

How urgent is CVE-2025-60859?

Priority 32/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2025-7786 LOW 3.5 UPGRADE A vulnerability, which was classified as problematic, has been found in Gnuboard g6 up to 6.0.10
CVE-2025-61464 MEDIUM 6.5 UPGRADE gnuboard gnuboard4 v4.36.04 and before is vulnerable to Second-order SQL Injection via the search_table in bbs
CVE-2024-41475 HIGH 8.8 DOWNGRADE Gnuboard g6 6.0.7 is vulnerable to Session hijacking due to a CORS misconfiguration.
CVE-2024-39097 MEDIUM 6.1 UPGRADE There is an Open Redirect vulnerability in Gnuboard v6.0.4 and below via the `url` parameter in login path.
CVE-2024-37658 MEDIUM 6.1 DOWNGRADE An open redirect vulnerability in gnuboard5 v.5.5.16 allows a remote attacker to obtain sensitive information

References

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