CVE-2025-51734: Cross-site scripting (XSS) vulnerability in HCL Technologies Ltd

Routine

MEDIUM 5.4DOWNGRADE

CVE-2025-51734 is a medium-severity flaw (CVSS 5.4) affecting unica. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in HCL Technologies Ltd. Unica 12.0.0.

Why this priority

No elevated risk signals yet

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	None
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-11-28
Last modified	2026-10-26

Publisher (CNA): MITRE · Vendor: hcltech

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-28 15:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

hcltech unica DOWNGRADE

Affected: 12.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 12.0.0 (Debian / Ubuntu)

apt-cache madison unica sudo apt install unica=<VERSION_BEFORE_12.0.0> sudo apt-mark hold unica

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

dnf --showduplicates list unica sudo dnf downgrade unica-<VERSION_BEFORE_12.0.0> sudo dnf versionlock add unica

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-2025-51734?

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

Is CVE-2025-51734 being exploited?

CVE-2025-51734 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-2025-51734 affect?

CVE-2025-51734 affects unica. Severity is medium (CVSS 5.4). Cross-site scripting (XSS) vulnerability in HCL Technologies Ltd. Unica 12.0.0.

How urgent is CVE-2025-51734?

Priority 21/100. No elevated risk signals yet.

Related CVEs

CVE-2025-51735 HIGH 7.5 DOWNGRADE CSV formula injection vulnerability in HCL Technologies Ltd

References

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