CVE-2018-15903: The Discuss v1.2.1 module in Claromentis 8.2.2 is vulnerable to stored Cross Site Scripting (XSS)

Routine

MEDIUM 5.4DOWNGRADE

CVE-2018-15903 is a medium-severity flaw (CVSS 5.4) affecting claromentis. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Discuss v1.2.1 module in Claromentis 8.2.2 is vulnerable to stored Cross Site Scripting (XSS). An authenticated attacker will be able to place malicious JavaScript in the discussion forum, which is present in the login landing page. A low privilege user can use this to steal the session cookies from high privilege accounts and hijack these, enabling them to hijack the elevated session and perform actions in their security context.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.4 (Medium)
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	2018-10-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: claromentis

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

Am I affected?

Timeline

2018-10-08 17:29 UTCPublished CVE record published
2026-06-17 01:43 UTCUpdated Record last modified

claromentis claromentis DOWNGRADE

Affected: 8.2.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.2.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 8.2.2 (Debian / Ubuntu)

apt-cache madison claromentis sudo apt install claromentis=<VERSION_BEFORE_8.2.2> sudo apt-mark hold claromentis

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

dnf --showduplicates list claromentis sudo dnf downgrade claromentis-<VERSION_BEFORE_8.2.2> sudo dnf versionlock add claromentis

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-2018-15903?

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

Is CVE-2018-15903 being exploited?

CVE-2018-15903 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-2018-15903 affect?

CVE-2018-15903 affects claromentis. Severity is medium (CVSS 5.4). The Discuss v1.2.1 module in Claromentis 8.2.2 is vulnerable to stored Cross Site Scripting (XSS). An authenticated attacker will be able to place malicious JavaScript in the discussion forum, which is present in the login landing page. A l

How urgent is CVE-2018-15903?

Priority 37/100. Public exploit reference

References

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