CVE-2018-15707: Advantech WebAccess 8.3.1 and 8.3.2 are vulnerable to cross-site scripting in the Bwmainleft.asp page

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MEDIUM 5.4DOWNGRADE

CVE-2018-15707 is a medium-severity flaw (CVSS 5.4) affecting webaccess. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Advantech WebAccess 8.3.1 and 8.3.2 are vulnerable to cross-site scripting in the Bwmainleft.asp page. An attacker could leverage this vulnerability to disclose credentials amongst other things.

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	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-10-31
Last modified	2026-06-17

Publisher (CNA): Tenable Network Security, Inc. · Vendor: advantech

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

Am I affected?

Timeline

2018-10-31 22:29 UTCPublished CVE record published
2026-06-17 01:42 UTCUpdated Record last modified

advantech webaccess DOWNGRADE

Affected: 8.3.1 · 8.3.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.3.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 8.3.1 (Debian / Ubuntu)

apt-cache madison webaccess sudo apt install webaccess=<VERSION_BEFORE_8.3.1> sudo apt-mark hold webaccess

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

dnf --showduplicates list webaccess sudo dnf downgrade webaccess-<VERSION_BEFORE_8.3.1> sudo dnf versionlock add webaccess

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: Advantech WebAccess SCADA 8.3.2 - Remote Code 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-2018-15707?

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

Is CVE-2018-15707 being exploited?

CVE-2018-15707 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-2018-15707 affect?

CVE-2018-15707 affects webaccess. Severity is medium (CVSS 5.4). Advantech WebAccess 8.3.1 and 8.3.2 are vulnerable to cross-site scripting in the Bwmainleft.asp page. An attacker could leverage this vulnerability to disclose credentials amongst other things.

How urgent is CVE-2018-15707?

Priority 44/100. Public exploit reference

Software pages

Advantech vulnerabilities

Related CVEs

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CVE-2023-2866 HIGH 7.3 DOWNGRADE If an attacker can trick an authenticated user into loading a maliciously crafted .zip file onto Advantech We
CVE-2021-38408 CRITICAL 9.8 UPGRADE A stack-based buffer overflow vulnerability in Advantech WebAccess Versions 9.02 and prior caused by a lack of
CVE-2021-38389 CRITICAL 9.8 UPGRADE Advantech WebAccess versions 9.02 and prior are vulnerable to a stack-based buffer overflow, which may allow a
CVE-2021-34540 MEDIUM 6.1 DOWNGRADE Advantech WebAccess 8.4.2 and 8.4.4 allows XSS via the username column of the bwRoot.asp page of WADashboard.

References

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