CVE-2018-18845: internal/advanced_comment_system/index.php and internal/advanced_comment_system/admin.php in Advanced Comment

This month

MEDIUM 6.1DOWNGRADE

CVE-2018-18845 is a medium-severity flaw (CVSS 6.1) affecting advanced comment system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

internal/advanced_comment_system/index.php and internal/advanced_comment_system/admin.php in Advanced Comment System, version 1.0, contain a reflected cross-site scripting vulnerability via ACS_path. A remote unauthenticated attacker could potentially exploit this vulnerability to supply malicious HTML or JavaScript code to a vulnerable web application, which is then reflected back to the victim and executed by the web browser. The product is dis

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	1.4% (top 27%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-03-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: advanced comment system project

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

Am I affected?

Timeline

2019-03-21 16:00 UTCPublished CVE record published
2026-06-17 01:48 UTCUpdated Record last modified

advanced comment system project advanced comment system DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy advanced-comment-system || rpm -q advanced-comment-system || advanced-comment-system --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison advanced-comment-system sudo apt install advanced-comment-system=<VERSION_BEFORE_1.0> sudo apt-mark hold advanced-comment-system

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

dnf --showduplicates list advanced-comment-system sudo dnf downgrade advanced-comment-system-<VERSION_BEFORE_1.0> sudo dnf versionlock add advanced-comment-system

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-2018-18845?

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

Is CVE-2018-18845 being exploited?

CVE-2018-18845 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-2018-18845 affect?

CVE-2018-18845 affects advanced comment system. Severity is medium (CVSS 6.1). internal/advanced_comment_system/index.php and internal/advanced_comment_system/admin.php in Advanced Comment System, version 1.0, contain a reflected cross-site scripting vulnerability via ACS_path. A remote unauthenticated attacker could

How urgent is CVE-2018-18845?

Priority 45/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-35598 HIGH 7.5 DOWNGRADE ACS Advanced Comment System 1.0 is affected by Directory Traversal via an advanced_component_system/index.php?
CVE-2018-18619 CRITICAL 9.8 DOWNGRADE internal/advanced_comment_system/admin.php in Advanced Comment System 1.0 is prone to an SQL injection vulnera

References

← Back to latest CVEs