CVE-2025-3531: A vulnerability classified as problematic has been found in YouDianCMS 9.5.21

Routine

MEDIUM 4.3DOWNGRADE

CVE-2025-3531 is a medium-severity flaw (CVSS 4.3) affecting youdiancms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability classified as problematic has been found in YouDianCMS 9.5.21. This affects an unknown part of the file /App/Tpl/Admin/Default/Log/index.html. The manipulation of the argument UserName/LogType leads to cross site scripting. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-79, CWE-94
Published	2025-04-13
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: youdiancms

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

Am I affected?

Timeline

2025-04-13 06:15 UTCPublished CVE record published
2026-06-17 09:20 UTCUpdated Record last modified

youdiancms youdiancms DOWNGRADE

Affected: 9.5.21

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.5.21

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 9.5.21 (Debian / Ubuntu)

apt-cache madison youdiancms sudo apt install youdiancms=<VERSION_BEFORE_9.5.21> sudo apt-mark hold youdiancms

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

dnf --showduplicates list youdiancms sudo dnf downgrade youdiancms-<VERSION_BEFORE_9.5.21> sudo dnf versionlock add youdiancms

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-2025-3531?

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

Is CVE-2025-3531 being exploited?

CVE-2025-3531 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-2025-3531 affect?

CVE-2025-3531 affects youdiancms. Severity is medium (CVSS 4.3). A vulnerability classified as problematic has been found in YouDianCMS 9.5.21. This affects an unknown part of the file /App/Tpl/Admin/Default/Log/index.html. The manipulation of the argument UserName/LogType leads to cross site scripting.

How urgent is CVE-2025-3531?

Priority 30/100. Public exploit reference

Related CVEs

CVE-2025-3533 MEDIUM 4.3 DOWNGRADE A vulnerability, which was classified as problematic, has been found in YouDianCMS 9.5.21
CVE-2025-3532 MEDIUM 4.3 DOWNGRADE A vulnerability classified as problematic was found in YouDianCMS 9.5.21
CVE-2024-7330 MEDIUM 6.3 DOWNGRADE A vulnerability has been found in YouDianCMS 7 and classified as critical
CVE-2024-7329 MEDIUM 6.3 DOWNGRADE A vulnerability, which was classified as critical, was found in YouDianCMS 7
CVE-2024-7328 MEDIUM 5.3 DOWNGRADE A vulnerability, which was classified as problematic, has been found in YouDianCMS 7

References

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