CVE-2025-34237: Advantech WebAccess/VPN versions prior to 1.1.5 contain a stored cross-site scripting (XSS) vulnerability via

Q: How do I fix CVE-2025-34237?

webaccess\/vpn: upgrade to 1.1.5. Exact commands for each OS are on this page.

Q: Is CVE-2025-34237 being exploited?

CVE-2025-34237 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-34237 affect?

CVE-2025-34237 affects webaccess\/vpn. Severity is medium (CVSS 5.4). Advantech WebAccess/VPN versions prior to 1.1.5 contain a stored cross-site scripting (XSS) vulnerability via StandaloneVpnClientsController.addStandaloneVpnClientAction(). Insufficient validation or escaping of user-supplied input may allo

Q: How urgent is CVE-2025-34237?

Priority 22/100. No elevated risk signals yet.

Routine

MEDIUM 5.4UPGRADE

CVE-2025-34237 is a medium-severity flaw (CVSS 5.4) affecting webaccess\/vpn. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Advantech WebAccess/VPN versions prior to 1.1.5 contain a stored cross-site scripting (XSS) vulnerability via StandaloneVpnClientsController.addStandaloneVpnClientAction(). Insufficient validation or escaping of user-supplied input may allow an attacker to inject and execute arbitrary script in the context of a victim's browser.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-11-06
Last modified	2026-10-07

Publisher (CNA): VulnCheck · Vendor: advantech

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-06 20:15 UTCPublished CVE record published
2026-10-07 21:10 UTCUpdated Record last modified

advantech webaccess\/vpn UPGRADE

Affected: < 1.1.5

Fixed in: 1.1.5

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.1.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade webaccessvpn

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade webaccessvpn

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2025-34237?

webaccess\/vpn: upgrade to 1.1.5. Exact commands for each OS are on this page.

Is CVE-2025-34237 being exploited?

CVE-2025-34237 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-2025-34237 affect?

CVE-2025-34237 affects webaccess\/vpn. Severity is medium (CVSS 5.4). Advantech WebAccess/VPN versions prior to 1.1.5 contain a stored cross-site scripting (XSS) vulnerability via StandaloneVpnClientsController.addStandaloneVpnClientAction(). Insufficient validation or escaping of user-supplied input may allo

How urgent is CVE-2025-34237?

Priority 22/100. No elevated risk signals yet.

Software pages

Advantech vulnerabilities

Related CVEs

CVE-2025-34239 HIGH 7.2 UPGRADE Advantech WebAccess/VPN versions prior to 1.1.5 contain a command injection vulnerability in AppManagementCont
CVE-2025-34238 MEDIUM 6.5 UPGRADE Advantech WebAccess/VPN versions prior to 1.1.5 contain an absolute path traversal via AjaxStandaloneVpnClient
CVE-2025-34240 MEDIUM 6.5 UPGRADE Advantech WebAccess/VPN versions prior to 1.1.5 contain a SQL injection vulnerability in AppManagementControll
CVE-2025-34241 MEDIUM 6.5 UPGRADE Advantech WebAccess/VPN versions prior to 1.1.5 contain a SQL injection vulnerability in AjaxDeviceController.
CVE-2025-34242 MEDIUM 6.5 UPGRADE Advantech WebAccess/VPN versions prior to 1.1.5 contain a SQL injection vulnerability in AjaxNetworkController

References

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