CVE-2021-27930: Multiple stored XSS vulnerabilities in IrisNext Edition 9.5.16, which allows an authenticated (or compromised)

Routine

MEDIUM 5.4DOWNGRADE

CVE-2021-27930 is a medium-severity flaw (CVSS 5.4) affecting irisnext. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple stored XSS vulnerabilities in IrisNext Edition 9.5.16, which allows an authenticated (or compromised) user to inject malicious JavaScript in folder/file name within the application in order to grab other users’ sessions or execute malicious code in their browsers (1-click RCE).

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	0.5% (top 54%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-07-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: irislink

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

Am I affected?

Timeline

2021-07-06 12:15 UTCPublished CVE record published
2026-06-17 03:45 UTCUpdated Record last modified

irislink irisnext DOWNGRADE

Affected: 9.5.16

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.5.16

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 9.5.16 (Debian / Ubuntu)

apt-cache madison irisnext sudo apt install irisnext=<VERSION_BEFORE_9.5.16> sudo apt-mark hold irisnext

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

dnf --showduplicates list irisnext sudo dnf downgrade irisnext-<VERSION_BEFORE_9.5.16> sudo dnf versionlock add irisnext

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-2021-27930?

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

Is CVE-2021-27930 being exploited?

CVE-2021-27930 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-2021-27930 affect?

CVE-2021-27930 affects irisnext. Severity is medium (CVSS 5.4). Multiple stored XSS vulnerabilities in IrisNext Edition 9.5.16, which allows an authenticated (or compromised) user to inject malicious JavaScript in folder/file name within the application in order to grab other users’ sessions or execute

How urgent is CVE-2021-27930?

Priority 35/100. Public exploit reference

Related CVEs

CVE-2022-26111 HIGH 8.8 UPGRADE The BeanShell components of IRISNext through 9.8.28 allow execution of arbitrary commands on the target server

References

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