5.4

CVE-2026-21788: hclsoftware connections Cross-site Scripting

CVSS: 5.4v3.1MediumAnalyzed
Published 19-03-2026Last modified 19-03-2026
Open JSON

Vulnerability summary

CVE-2026-21788 is a medium (CVSS 5.4) Cross-site Scripting vulnerability in hclsoftware connections. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 5.9% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.17%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 19-03-2026
    PublishedVulnerability first disclosed.
  2. 19-03-2026
    Last modifiedVulnerability information updated.

Description

HCL Connections is vulnerable to a cross-site scripting attack where an attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user which leads to executing malicious script code.  This may allow the attacker steal cookie-based authentication credentials and comprise user's account then launch other attacks.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

+0.01 pp

From 0.16% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.17%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Hclsoftware1 product
Hcltech1 product
  • connections8.0 | 8.0:cumulative_release1 | 8.0:cumulative_release10 | 8.0:cumulative_release11 | 8.0:cumulative_release12 | 8.0:cumulative_release2 | 8.0:cumulative_release3 | 8.0:cumulative_release4 | 8.0:cumulative_release5 | 8.0:cumulative_release6 | 8.0:cumulative_release7 | 8.0:cumulative_release8 | 8.0:cumulative_release9

2 vendors · 2 products

References

1 links