CVE-2021-26122: LivingLogic XIST4C before 0.107.8 allows XSS via feedback.htm or feedback.wihtm.

Q: How do I fix CVE-2021-26122?

xist4c: upgrade to 0.107.8. Exact commands for each OS are on this page.

Q: Is CVE-2021-26122 being exploited?

CVE-2021-26122 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-2021-26122 affect?

CVE-2021-26122 affects xist4c. Severity is medium (CVSS 6.1). LivingLogic XIST4C before 0.107.8 allows XSS via feedback.htm or feedback.wihtm.

Q: How urgent is CVE-2021-26122?

Priority 39/100. Public exploit reference

Routine

MEDIUM 6.1UPGRADE

CVE-2021-26122 is a medium-severity flaw (CVSS 6.1) affecting xist4c. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LivingLogic XIST4C before 0.107.8 allows XSS via feedback.htm or feedback.wihtm.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-05-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: livinglogic

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

Am I affected?

Timeline

2021-05-07 12:15 UTCPublished CVE record published
2026-06-17 03:42 UTCUpdated Record last modified

livinglogic xist4c UPGRADE

Affected: < 0.107.8

Fixed in: 0.107.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy xist4c || rpm -q xist4c || xist4c --version

2. UPGRADE to 0.107.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade xist4c

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade xist4c

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-2021-26122?

xist4c: upgrade to 0.107.8. Exact commands for each OS are on this page.

Is CVE-2021-26122 being exploited?

CVE-2021-26122 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-2021-26122 affect?

CVE-2021-26122 affects xist4c. Severity is medium (CVSS 6.1). LivingLogic XIST4C before 0.107.8 allows XSS via feedback.htm or feedback.wihtm.

How urgent is CVE-2021-26122?

Priority 39/100. Public exploit reference

Related CVEs

CVE-2021-26123 MEDIUM 6.1 UPGRADE LivingLogic XIST4C before 0.107.8 allows XSS via login.htm, login.wihtm, or login-form.htm.

References

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